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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:

User Vincet
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4 votes

Answer:

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

Step-by-step explanation:

Hope this was helpful

User Andrei Tserakhau
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