ANSWERS: 4
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Really fast!
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They are a highly effective internal parasite
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Pretty much the same way you or I do- their cells divide, based on the amount of nutrients they get. The get those nutrients from the mother, through the umbilical cord. If you're looking for more advanced, detailed descriptions, comment to this answer and I'll get you some websites. There are amazing pictures out there of unborn babies!
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by being surronded by water.
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