Final answer:
The Endosymbiotic Theory is backed by organelles having their own plasma membranes, mitochondria having their own DNA, and the connection between photosynthetic bacteria and chloroplast organelles.
Explanation:
Endosymbiotic Theory is supported by evidence such as organelles having their own plasma membranes, mitochondria possessing their own DNA, and the relationship between photosynthetic bacteria and chloroplast organelles. These characteristics align with the theory that some organelles in eukaryotic cells were once prokaryotic microbes and evolved through a symbiotic relationship.
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