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algae
A large, diverse group of simple photosynthetic organisms, among the most primitive life forms known, some of which are prokaryotes and others eukaryotes. They occur in aquatic environments or in moist locations on land. The body of an alga may be unicellular, or multicellular in the form of filaments, ribbons, or plates. They range in size from microscopic to several meters long in the case of giant kelps. So-called "blue-green algae" are now recognized as being a type of bacteria known as cyanobacteria.
Related category
• MICROBIOLOGY
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