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1.Human development is a continuous process that begins when an ovum from a female is fertilized by a____from a male.A. spermB. stemC. stuffD. spin

1.Human development is a continuous process that begins when an ovum from a female is fertilized by a____from a male.

A. sperm

B. stem

C. stuff

D. spin

题目解答

答案

A. sperm

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