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Algae is an informal term for a large, diverse group of photosynthetic eukaryotic organisms that are not necessarily closely related, and is thus polyphyletic.

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What is "beto carotene" and how can it turn lakes pink?

Part is also coming from salt loving halo-bacteria which use are not algae but are photosynthetic. … In the case of that particular lake algae appears to be the major factor. …
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