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A scientific explanation states that eukaryotic cells became more complex when one cell began living inside...

A scientific explanation states that eukaryotic cells became more complex when one cell began living inside another cell. Which evidence would best support this explanation?

Answer

Some organelles contain their own DNA and ribosomes. This evidence supports the endosymbiotic theory, which suggests that certain organelles, like mitochondria and chloroplasts, originated as free-living bacteria that were engulfed by ancestral eukaryotic cells.

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