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kati45 [8]
3 years ago
14

Sara just found out that her sister conceived about seven days ago. She rushes to find a book on pregnancy so that she can learn

more about it. The book says that around the seventh day of pregnancy the cells of the zygote begin to:
Biology
1 answer:
vazorg [7]3 years ago
5 0

Answer:

differentiate and/or the embryo has doubled its size. Aging results in a gradual decline in female fertility.

Explanation:

Hope this was helpful

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