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Comment upon the following: Blood o...

Comment upon the following:
Blood of mother and foetus never mix with each other, but there is always some barrier between the two.

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  3. Comment upon the following: Blood of mother and foetus never mix ...

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  5. Comment upon the following: At the time of birth, the testes desce...

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  8. Comment upon the following: Twins may or may not be identical.

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