Photosynthesis is used by plants to crest food. This is essential to all life because of the oxygen plants give off in the process, and the food source the plant becomes.
There is quite a lot, but the fact that both mitochondria and chloroplasts have their own circular DNAis what I would call "key" evidence. That is, these organelles are not "manufactured" by the cell (i.e., there are no "genes for mitochondria" in eukaryote genomes): like their ancestral bacteria, they reproduce by binary fission.
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Start with the one that you know better the beginning of essays are hakf the tine awkward anyway.
Im pretty sure its the genus
I guess it science Oklahoma And ecosystem and protozoans Andrew And thanks