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Basically because your skin has several layers to it (see link, below), and the layer that has the blood vessels capable of bleeding in it is further down than a superficial scrape would affect.
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Answer:
Reproducing is fast for some animals, but can mess up their DNA and genetics. Humans and other aninkas take a while. It has a better chance of perfect genetics and heredity from parent, this goes along with sexual and asexual reproduction.
Explanation:
Muscle Cells are known to have the greatest number of mitochondria.
