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15. These photosynthetic organisms can live in extreme environments, sometimes harnessing energy from chemicals, and are among some of the oldest organisms on Earth.
Οalgae
O protists
O cyanobacteria
O diatoms

Respuesta :

slanceb

Answer:

cyanobacteria

Explanation:

the answer of this question the 3rd one, because if you were to think and look up the oldest Bactria it would be that answer.

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