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Answer: they need to provide a lot of energy.
Explanation:
fat cells have many mitochondria because they store a lot of energy. Muscle cells have many mitochondria, which allows them to respond quickly to the need for doing work.
Answer: the correct answer may have taken place independently by a variety os species descended from aquatic ancestors.
Explanation:
Scientists think that life started in the oceans as early as 4 to 4.2 billion years ago.