Light disappears entirely. Sunlight is unable to penetrate that deep, which is why many fish have adapted to produce their own light.
Answer and Explanation:
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Answer: The skin and the bone marrow.
The bone marrow needs to be constantly producing all the blood cells because they don't have a long life and they need to be in big amounts. The skin cells, also need to be constantly dividing to replace old, dead, or damaged cells.
The liver cells are another example because they can regenerate after they become injured.