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cyanobacteria
Cyanobacteria still play an essential role in modern coral reef ecosystems by forming a major component of epiphytic, epilithic, and endolithic communities as well as of microbial mats. Cyanobacteria are grazed by reef organisms and also provide nitrogen to the coral reef ecosystems through nitrogen fixation.
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cyanobacteria
Pulling in carbon dioxide, breaking water molecules apart with the power of light, splicing the elements to build living material, and releasing oxygen gas in tiny puffs, they slowly transformed the atmosphere, and the planet along with it, until Earth could power the organic engines of animal life—muscles, nervous systems, brains
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