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There are several reasons. First, mitochondria have a capsule around them very similar to bacterial capsules. Second, mitochondria are the only organelles in animal cells with their own genetic material. Third, mitochondria replicate themselves. Fourth, mitochondria are genetically similar to some bacteria.

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11y ago
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11y ago

Because the cells divide into more cells

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Q: Why do scientists believe that mitochondria were separate organisms?
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