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

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.

it's the cell cycle, but cytokines is when the cell divides.

theres 3 stages interphase,mitosis,and cytokines.

interphase prepares the cell for division.

mitosis is the process of dividing the cell,it has 4 parts interphase,anaphase,metaphase,and telophase.

lastly there's cytokines,that's when the cell divides into 2 daughter cells