If you need a time frame, let's say 25 years.

EDIT: my question is plural, but of course it's fine to give a single species if you know of one

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[–] 15 points 2 months ago* (last edited 2 months ago)

Plankton

Primary producers (photo-synthesizers and chemo synthesizers). All other life gets energy from them.

Edited in response to OP's edit.

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