Also called âphytoplanktonâ (or, plant plankton), these plants are eaten by zooplankton (or, oxygen in the water. This is currently happening in Florida. Cyanobacterium is commonly found in fresh water lakes and cannot easily be visually distinguished from non-harmful green algae. Since carbon dioxide is acidic, it lowers pH. Blue-green algal bloom is a higher-than-normal concentration of microscopic plant-like organisms. To be clear, most algae-induced fish kills occur because of a lack of oxygen, not poisonous toxins. The Urban Algae Canopy by ecoLogic Studio, is a piece of bio-digital architecture on display at this year's Expo Milano 2015, which combines ⦠Algae often boom in ponds due to an imbalance in the level of phosphorus and nitrates. Algae are âprokaryotic organisms â cyanobacteria, also known as blue-green algae â as well as eukaryotic organisms (all other algal species)â that are photosynthetic 1. substances Blue-green algae need nutrients to . ... supply a large portion of the planetâs oxygen. The findings by the researchers show that not only does blue-green algae produce methane, but it does so in both dark and light conditions, and ⦠In general, algae produce oxygen and contribute to fueling healthy habitats. True algae can grow problematically in our nutrient-rich lakes, but cyanobacteria blooms are of special concern because some species can produce potent toxins. The blooms produce a toxin that can kill fish and even mammals if ingested in large amounts. In healthy aquatic habitats, algae are usually present in low numbers and the water appears clear. Cyanobacteria, also called blue-green algae, are microscopic organisms found naturally in all types of water. When I think that I have read that blue-green algae produces about half of the oxygen in the world, it makes me wonder how much our forests actually contribute. Algae will produce oxygen in the light. If you control the pH by adding CO2, the algae will consume it with the other nutrients (which you will hav... Like most plants, many algae produce oxygen during the daylight as a by-product of photosynthesis. No, they produce Co2 which is used for plants to breathe then the plants produce oxygen. Hello Rahman, Production of oxygen in higher quantity is possible by enhancing the growth of algae increasing their biomass. Under stressed environ... A coral reef is a marine ecosystem that is also often dependent on algae. The three sources of dissolved oxygen in water are atmo-spheric diffusion, wind circulation (which increases surface diffusion), and pho-tosynthesis of algae or submerged plants (which provides most of the oxygen). Both species do not have a similar connection. Algae are a basic component of a complex aquatic food web, converting the sunâs energy into a form useful to other aquatic life. Like all green plants, algae produce oxygen during the daylight hours as a by-product of. Last Friday, the Nebraska Game and Parks Commission, in conjunction with the Nebraska Department of Environmental Quality and Health and Human Services issued health alerts for harmful algal blooms in Blue-green algae produce their own food by the process of photosynthesis, which uses light, oxygen and nutrients. And your green algae will never break down either, it's as reliable as brewing beer or using yeast to raise bread. Cyanobacteria use gas vesicles for buoyance and depth regulation. Algae, Cyanobacteria, and Cyanobacteria Blooms. Green algae, members of the division Chlorophyta, comprising between 9,000 and 12,000 species. It's amazing that something so matted and gooey can produce oxygen! Volvoxes are an important part of the aquatic ecosystem. Blooms can look like foam, scum, mats, or paint on the surface of the water. The blooms produce a toxin that can kill fish and even mammals if ingested in large amounts. They produce approximately half of the oxygen in the atmosphere. During the biodiesel production process, algae consume carbon dioxide. Cyanobacteria, also called blue-green algae, were among the earliest organisms on Earth. Too much is bad. Credit: NOAA. One group of algae, known as blue-green algae (cyanobacteria), can produce toxins that can affect the health of fish and animals that come into contact with the water. The 400-litre bag of algae produces as much oxygen as a hectare of ⦠The answer is tiny organisms known as cyanobacteria, or blue-green algae. These biochemical poisons come in two main forms, hepatotoxins (that primarily target the liver) and neurotoxins (that target the nervous system). Due to their appearance, these bacteria are sometimes called blue-green algae, although they are not algae at all. Abstract. This is wrong. Oxygen can be produced by the green algae very fast. The fish in the water can predict the source of oxygen in the water. The children of the fish do like a lot of oxygen in the water. The eggs from the fish do grow faster, if the water has more oxygen. The green sulfur bacteria (Chlorobiaceae) are a family of obligately anaerobic photoautotrophic bacteria.Together with the non-photosynthetic Ignavibacteriaceae, they form the phylum Chlorobi.. Green sulfur bacteria are nonmotile (except Chloroherpeton thalassium, which may glide) and capable of anoxygenic photosynthesis. Phytoplankton are microscopic marine plants that produce roughly 80% of the worldâs oxygen. No, they produce Co2 which is used for plants to breathe then the plants produce oxygen. yes, already a lot of research is going on across the world to produce algal biomass as a potential nutritious feed stock or waste treatment, simul... In an era in which the consumption of fossil fuels is a prime topic of concern, few people realize that the oil we currently exploit comes mostly from Cretaceous deposits of marine algae. produce oxygen, build soil by providing food for decomposers, prevent erosion by holding soil, hold water, moderate the local climate Why do we study green algae with plants closest living relatives to land plants, transition from aquatic to terrestrial life occurred when land plants evolved from green algae Respiration disassembles carbon molecules and releases chemical energy. Phytoplankton is an âunicellular plant-like organismâ that âis the base of the marine food chain.â while aiding in the production of oxygen needed for life to ⦠. These are also thought to be where chloroplasts (found in plants) had their beginnings. âBlue-green algae is kind of a misnomer,â Csekitz said. Aquatic Plants: Algae. Scientists estimate that 50-80% of the oxygen production on Earth comes from the ocean. They can ... cyanobacteria,blue-green algae,blue green algae, Created Date: In fact, they are an essential part of a healthy body of water, as they produce oxygen and are themselves a source of food for certain aquatic animals. Cyanobacteria or âblue-green algaeâ, a type of blooming algae, can produce toxins. Cyanotoxins are among the most powerful natural poisons known. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. The corals and algae have a mutualistic relationship. In return, the algae produce oxygen and help the coral to remove wastes. Microalgae can be cultivated to have a ⦠Green algae that multiply can produce oxygen during the day; however, they consume oxygen during the night in the process of respiration. Cyanobacteria / s aɪ Ë æ n oÊ b æ k Ë t ɪÉr i É /, also known as Cyanophyta, are a phylum of Gram-negative bacteria that obtain energy via photosynthesis.The name cyanobacteria comes from their color (Greek: ÎºÏ Î±Î½ÏÏ, romanized: kyanós, lit. Secchi disks can be used to monitor bloom densities. They obtain their energy from photosynthesis, which does create oxygen. But, when blue-green algae die, they decompose by a process that uses cellular respiration, which uses up oxygen. Respiration disassembles carbon molecules and releases chemical energy. It is the decomposition of the cyanobacteria that causes oxygen depletion. The plant produces oxygen, which all living things require. When first discovered Cyanobacterium was called âblue-green algae;â although not an alga, cyanobacteria does produce cyanotoxin which is a type of algal toxin which is harmful to animal life. So by absorbing carbon dioxide, aquarium plants raise pH and make water more alkaline, or basic. Photoautrophic algae (requiring light for photosynthesis) as well as higher plants, perform photosynthesis when in the presence of adequate light,... The short answer is, yes we can. In 2008, myself and my business partner, Ms. Fran Wells, designed and developed a new type of algaculture system.... Trees âconsumeâ it as part of their photosynthesis process by âabsorbingâ carbon into their trunks and ⦠Several estimates indicate that the amount of oxygen produced by the algae is close to 50% of what terrestrial animals need. In aquatic ecosystems, algae play a major role not only by producing oxygen but making up the base of the food chain. Blue Green algae, Green algae, and autotrophic plants are photosynthetic organisms. The algae use them directly. In darkness, however, all plants consume oxygen, including algae. Algae are a single-celled organism that can pollute pond water and cause it to become green. Even though many people hate it, blue-green algae does serve a purpose. For this reason, algae biodiesel manufacturers are building biodiesel plants close to energy manufacturing plants that produce lots of carbon dioxide. The biotic nitrogen fixation is estimated to produce about 1.7 x 10 8 tons of ammonia per year,whereas atmospheric and industrial nitrogen fixation produce about 1.7 x 10 7 tons of ammonia per year. The algae live near the spongesâ surface, where it metabolizes and produces sugar and oxygen that sea sponges need in order to grow. Filamentous algae are important because they produce oxygen and food for the animals that live in the pond, but they also can cause problems such as clogs and stagnancy. Algae are primitive plants that, via photosynthesis, combine water and carbon dioxide to form sugars for energy and growth. When the bacteria group together, they form large clumps, which look very much like floating algae. They can also be found in estuarine and marine waters in the U.S. Cyanobacteria are often confused with green algae, because both can produce dense mats that can impede activities like swimming and fishing, and may cause odor problems and oxygen ⦠Algae, Cyanobacteria, and Cyanobacteria Blooms. Algae primarily make use of light energy to generate their own nutrition, and are also able to produce oxygen and other carbohydrates. Then red algae are green algae which are separated by about one billion years. kylee07drg October 18, 2012 . Overall the algae do produce oxygen. They obtain their energy from photosynthesis, which does create oxygen. But, when blue-green algae die, they d... Algae - Algae - Photosynthesis and light-absorbing pigments: Photosynthesis is the process by which light energy is converted to chemical energy whereby carbon dioxide and water are converted into organic molecules. Algae can be used to produce 'green diesel' (also known as renewable diesel, hydrotreating vegetable oil or hydrogen-derived renewable diesel) through a hydrotreating refinery process that breaks molecules down into shorter hydrocarbon chains used in diesel engines. Light microscopy image of a Cyanobacterium (Oxyphotobacteria). is bright green, but itâs still a variety of blue-green algae. Normally 15â20 minutes. Oxygen is produced by a chemical reaction not from an oxygen tank. There is no Plan B to provide more supplementary oxygen,... Algae and cyanobacteria can rapidly grow out of control, or âbloom,â when water is warm, slow-moving, and full of nutrients. This has a direct effect on aquatic animals, causing them to experience stress or could even result in fatalities. These toxins are released from the blue-green cells when they die and rupture. Key points: Algae is up to five times more effective at absorbing carbon than trees. Firstly, blue green algae (BGA) is not actually algae, but it looks like it. When dissolved oxygen concentration is low in the water (anoxic), sediments release phosphate into the water column. Plants, algae and cyanobacteria all engage in oxygenic photosythesis (top equation), which means that they require water and release oxygen. y making toxins, called cyanotoxins. The process occurs in almost all algae, and in fact much of what is known about photosynthesis was first discovered by studying the green alga Chlorella. In an open-raceway system, this is not a problem as the oxygen is simply returned to the atmosphere. Species of cyanobacteria, also referred to generically as "blue-green algae", were one of the first oxygen-producing bacteria on earth and are largely responsible for the evolution of the ecosystem. Analysis of RNA and DNA for different organisms shows that all other photosynthetic organisms derived this ability from cyanobacteria through endosymbiosis. Like plants, algae turn sunlight into food, making them primary producers. Algae produce oxygen as a waste product of photosynthesis. Blue green algae (cyanobacteria) have folds on their external membranes that function in photosynthesis, They produce oxygen as a by product and do not need it. Algal cultivation increasing globally for their different uses This is easy way to produce O2 with thir valuable materials world, these algae multiply quickly in water bodies with high nutrient levels. Precambrian bacteria used hydrogen sulfide instead of water (bottom equation) and did not release oxygen as a byproduct. Like plants, algae turn sunlight into food, making them primary producers. pollution, it is no wonder blue-green algae related problems are becoming more frequent. Cyanobacteria photosynthesise like plants and have similar requirements for sunlight, nutrients and carbon dioxide to grow and produce oxygen. The spores can be blown in different areas and wherever it finds a suitable spot, it will start to reproduce. Microscopic plants (algae) form the base of the aquatic food chain. Diatoms produce 50% of the air we breathe. The algae also make use of the oxygen for respiration. If you do discover blue-green algae in your pond youâre going to need to get rid of it. The word âalgaeâ applies to several different species that produce photosynthesis oxygen (the process of harvesting light energy from the sun to generate carbohydrates). When your pond turns green ⦠Under certain conditions, algae can grow excessively, resulting in an algal bloom: a visible, dense buildup of algae (Figure 1). Cyanobacteria (blue-green algae) are a type of microscopic, algae-like bacteria which inhabit freshwater, coastal and marine waters. Harmful algal blooms can occur in lakes, reservoirs, rivers, ponds, bays and coastal waters, and the toxins they produce can be harmful to human health and aquatic life. They carry out photosynthesis using sunlight, water, and carbon dioxide and produce carbohydrates and oxygen. Trees and algae sequester carbon dioxide naturally. The CO2 is converted to organic carbon in the form of sugar, and oxygen (O2) is released. One green algae that does not need to be introduced is called. Algae are a promising source of biofuels: besides being easy to grow and handle, some varieties are rich in oil similar to that produced by soybeans. One of the main reasons why algae spreads so quickly is because it reproduces through its own spores. Varieties include blue-green algae, green algae, red algae, and brown algae.â (Leisure Pro, 2019). But cyanobacteria have been important in other ways: they were probably responsible for creating an oxygen-rich atmosphere on earth, and they undergo a genetically well-understood type of circadian rhythm. Algae will produce oxygen in the light. However, they note that the emission of methane was lower under dark conditions. Individual algae are virtually invisible, but when they congregate, they turn into the green 'slime' on stream rocks. Cyanobacteria blooms can steal the oxygen and nutrients other organisms need to live. If you allow for the answer to include all aquatic plants (most of which are algae, then estimates put the percentage of oxygen produced in the oceans and lakes at about 45% of all oxygen produced by photosynthesis but the uncertainty in that number is huge. You can get really sick from blue-green algae, and so can your animals. If you control the pH by adding CO2, the algae will consume it with the other nutrients (which you will have to add as well). Sometimes these blooms are harmless. This results in a dead area. Blue-green algae, or cyanobacteria, can severely disrupt bodies of water when they undergo massive blooms. Oxygen is ⦠Adán Ramirez Sánchez/GreenFluidics. One physical factor that must be considered in answering your question is the solubility of oxygen. During times of rapid photosynthesis water quic... The green algae produce more oxygen than all of the plants on earth. The forests produce the oxygen, but the trees also consume oxygen at night, when they need to exchange gas in their leaves. The green algae produce more oxygen, than other plants. The green algae also grow very fast. Scientists believe phytoplankton in the Earth's oceans produce between 50 and 85 percent of the planet's oxygen. Seaweed are not plants, but are algae. Blue-green algae can also kill fish indirectly by causing oxygen levels to drop below the threshold for fish survival. During the photosynthetic process, phytoplankton produce oxygen as a byproduct. They also produce oxygen through this process. The majority of this production is from oceanic plankton â drifting plants, algae, and some bacteria that can photosynthesize. It has the consistency of mucus. These organisms have the capability to become toxic or harmful by other means such as lowering oxygen in the water. Algae blooms in natural water bodies or fish ponds normally produce much more oxygen in the daylight than they consume during the night, but some situations reduce the amount of oxygen a bloom produces without reducing its nighttime oxygen ⦠If we can learn about and notice what plants and trees give off the most oxygen, and absorb the most carbon, we could grow more of those. When blue-green algae grow unchecked in lakes, they may interfere with recreation in and on the water. Through carbon fixation, diatoms remove carbon dioxide (CO2) from the atmosphere. Dead, decomposing algae kills oxygen producing plants. However, algae are actually neither plants nor animals. An overview of photosynthetic hydrogen and oxygen production by green algae in the context of its potential as a renewable chemical feedstock and energy carrier is presented. Click to see full answer. According to a study published in Science Advances today (January 15), they also produce the greenhouse gas methane. The algae also make use of the oxygen for respiration. They are true bacteria that function like algae and are commonly referred to as âblue-green algaeâ. This is wrong. Algae produce hydrogen under certain conditions. Blue-green algae also contain toxins which cause liver and nervous system damage if ingested by humans and dogs. A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights that is set to cycle between 12 hours of light and 12 hours of dark. To understand how ultrasound waves target blue-green algae, it is important to know their growing mechanism. Photosynthetic bacteria like purple bacteria or green sulfur bacteria carry out anoxygenic photosynthesis. Early in the history of life, algae changed the planetâs atmosphere by producing oxygen, thus paving the way for the evolution of eukaryotic organisms. Like higher plants, algae use photosynthesis to turn carbon dioxide and nitrogen compounds to produce sugar and oxygen. Well, technically, YES. Oxygen, as you know, causes the oxidation of substances. So, when we breathe in Oxygen, the Oxidation takes place in the at... Between 70 and 80 percent of the oxygen on our planet is generated by photosynthetic algae and cyanobacteria. What can generate clean energy, biomass for fertilizers, convert CO2 into oxygen, and be used in space? So when conditions of nutrients and temperature are just right, an algal bloom can result. In other words, through photosynthesis, algae pull carbon dioxide from the air, replacing it with oxygen. Now, the question is, what if there would be no other plants except algae? Green algae produce 70 to 80% of the oxygen on earth. Blue-green algae, more correctly known as cyanobacteria, are frequently found in freshwater systems. Excess algae will not kill your fish directly but indirectly yes, because though algae produce oxygen during day, it consumes oxygen during night and this can kill fish because of the reduced levels of oxygen in the water. Biological hydrogen production is done in a bioreactor based on the production of hydrogen by algae. Algae are very important because they make much of Earthâs oxygen, which humans and other animals need to breathe. Just like live aquatic plants algae will produce oxygen in some form and some fish species will actually eat algae as food. In reality itâs many tiny bacteria that canât be seen with the naked eye. The dissolved oxygen concentrations in both flasks are monitored. Cyanobacteria are photosynthetic. They are a naturally occurring component of freshwater environments. That's great! On the basis of these âoptimalâ assumptions, it can be calculated that green algae could produce a maximum of 10 mol (20 g) H 2 per m 2 culture area per day. substances Blue-green algae need nutrients to . Algae are typically photosynthetic, meaning they need carbon dioxide and sunlight to grow â just like plants. Blue-green algae are the richest sources of chlorophyll found in nature. Blue-green algae are the richest sources of chlorophyll found in nature. Algae occur in three basic forms: planktonic, filamentous, and macrophytic. Green algae â these species live not only in the seas and oceans. Algae are âprokaryotic organisms â cyanobacteria, also known as blue-green algae â as well as eukaryotic organisms (all other algal species)â that are photosynthetic 1. Cyanobacteria are amongst the most ancient forms of life and they have been contributing oxygen to ⦠Remember, any coralline algae must be introduced to the tank, it will not grow on its own, this included green coralline algae. Eventually fish canât pull enough oxygen out of the water and try to head to safer waters. Green algae get their color from chlorophyll and exist on or near the surface where there is plenty of sunlight. Harmful algal blooms are mainly the result of a type of algae called cyanobacteria, also known as blue-green algae. Anoxygenic Photosynthetic Bacteria . Algae are photosynthetic organisms, meaning they use sunlight to process food and produce oxygen. They can reproduce very quickly, multiplying up to ten times a day. photosynthesis. In extremely rare instances, toxin-producing blue-green algae have resulted in the sickness or death of animals, including livestock and particularly dogs. Why should I be aware of blue-green algae? photosynthesis. Algae does feel really gross. Because, like humans, the green algae need oxygen to ⦠Blue-green algae. What produces green algae? As you know, algae produce the highest levels of oxygen in the planet and can capture carbon dioxide. Algae also produce another fuel: hydrogen. Green algae are not as common in the ocean as brown and red seaweed. As the bloom becomes less intense, decaying and dead algae can lower oxygen levels within the water. 1. In aquatic ecosystems, algae play a major role not only by producing oxygen but making up the base of the food chain. They are widespread in freshwater habitats as well; some of them even live and thrive in moist soil. These single-celled organisms live in fresh, brackish (combined salt ⦠Green algae produce 70 to 80% of the oxygen on earth. Blue-green algae refers to several species of bacteria that produce blue-green colored pigments. This type of green looking algae can appear almost neon in color. Algae. Because of the plant-like activities, Volvoxes and all other green algae are autotrophic organisms. This is usually a major source of oxygen in fish ponds. and in the process produce a significant amount of the oxygen we breathe every day. In darkness, however, all plants consume oxygen, including algae. India has the capacity to produce more than 7,000 metric tonnes of medical oxygen. The major manufacturers are Inox Air Products, Linde India, Goya... These little organisms are also the basis of the food web that produces the fish we love to view and catch. It is fast growing, and can coat your rocks in a matter of a week. Nutrients exist in various forms in freshwater. With that background, you might be thinking: without algae, I wouldn't be able to breathe clean air and oxygen, let alone exist. Planktonic is very beneficial in small amounts as it produces oxygen and is a food source to all the small fish in ponds. Because algae continue to use oxygen at night, however, large populations of algae in a pond can deplete the oxygen supply in the water overnight, causing a low-oxygen condition that can be harmful or even fatal to fish and other aquatic life. Table I. This current bloom is caused by cyanobacteria (blue-green algae) that has the capability of producing toxins. This phenomenon encourages the growth of algae. Plankton are not just one species ⦠When the huge amounts of algae die and begin to decompose, the microbes doing the decomposing use up a lot of oxygen and produce a lot of carbon dioxide. At the same time, photosynthesis also consumes carbon dioxide (CO 2) and produces oxygen (O 2). These toxins can kill wild animals, livestock and pets. Plankton die-offs cause rapid oxygen depletions for two reasons: 1) the remaining dissolved oxygen is consumed by aerobic bacteria and fungi in the process of decaying the dead algae and 2) few live phytoplankton remain to produce more oxygen. In other words, through photosynthesis, algae pull carbon dioxide from the air, replacing it with oxygen. Photo Credit: Fischer Laboratory/Caltech The ability to generate oxygen through photosynthesisâthat helpful service performed by plants and algae, making life possible for humans and animals on Earthâevolved just once, roughly 2.3 billion years ago, in certain types of cyanobacteria. The chlorophyll molecules absorb the sunlight and convert it into biological energy. Since cyanobacteria are photosynthetic organisms like green plants, they actually consume carbon dioxide, which is considered a green house gas, and produce oxygen. The blue-green algae, however, share the property of an oxygen-evolving type of photosynthesis with the eucaryotic algae and higher plants and produce phycoerythrin and phycocyanin, two photosynthetic pigments characteristic of the Rhodophyta, or red algae, and one or two other smaller groups. Not only do algae provide much of the Earth's oxygen, they are also the base for almost all marine life. so we can use this ability to reduce carbon dioxide and produce more oxygen. The oxygen produced by these algae allowed land based life to evolve and they produce half the oxygen we breathe today. Even today, it is responsible for producing about half the world's oxygen. We breathe the oxygen that diatoms release. If the oxygen is used faster than plants and algae can produce it, problems can occur. ? What does it look like? Some blue-green algal strains produce toxins, threatening human and animal health. Fish die. Hi, Rahman, the highest production of oxygen is at blooming of algae! Production of oxygen is connected with growing of total biomass: look basic e... Big blue-green algal blooms tend to occur when the weather is warm and sunny, roughly around 75 degrees Fahrenheit, and the water is warm. Tiny floating plants, called algae, live in lakes, wetlands, and ponds. ⦠Blue-green algae can also kill fish indirectly by causing oxygen levels to drop below the threshold for fish survival. Algae are mostly aquatic, plant-like organisms that can range in size from microscopic to giant kelp found in the ocean. There are alternatives, writes Diane Lewis. Several estimates indicate that the amount of oxygen produced by the algae is close to 50% of what terrestrial animals need. Blue-Green Algae (Toxic) This is also known as planktonic algae, it is very harmful to all pets and even us humans. Phytoplankton, including algae, make oxygen by photosynthesizing sunlight. Blue-green algae (of the Cyanophyta family) are extremely hardy survivors and can adapt to a wide range of light, heat, carbon dioxide levels, oxygen levels and unique aqueous physical environments. Algae produce oxygen, a useful by-product, but when sunlight is not available at night, they quickly respire. This planet-changing biological invention has never been duplicated, as far as anyone can tell. to grow and produce new plant tissue. Green algae may occur as single cells (either motile of nonmotile), in colonies (more often nonmotile) and as multicellular filaments. In a well-lit aquarium, algae give off more oxygen than they use. However, a few species of blue-green algae, such as Microcystis, Aphanizomenon, and Anabaena, produce toxins capable of causing illness in humans and animals.These toxins can cause gastroenteritis, neurological disorders, and possibly cancer. Agree with Fidelisâ answer to a large extent. The issues to understand is that there are many types of algae, all algae do not contribute to declin... Blue-green algae blooms that occur in freshwater lakes and ponds can be directly toxic to fish and wildlife. The ability to generate oxygen through photosynthesisâthat helpful service performed by plants and algae, making life possible for humans and animals on Earthâevolved just once, roughly 2.3 billion years ago, in certain types of cyanobacteria.
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