Endosymbiotic theory is a theory of evolution that eukaryotes came from prokaryotes. Mitochondria and chloroplasts both have the double membranes. Each of them also contain genetic material that are replicated with a separate cell cycle. Both organelles have their own ribosomes.
The answer is The Nervous System.
It interacts with all the other systems, it tells them what to do.
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C. Mass
Mass is the amount of matter in an object.
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