Answer:
The evidence suggests that these chloroplast organelles were also once free-living bacteria.
Explanation:
The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them.
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The Electrons would need to be in a covalent bond. Covalent means that the electrons are equally shared between atoms.
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Answer:
answer is d) all of these choices are correct.
