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tekilochka [14]
2 years ago
12

Why a female may have two periods in one month?

Biology
1 answer:
Tema [17]2 years ago
7 0

Answer:

The average menstrual cycle is 28 days long but can vary from 24 to 38 days. If a menstrual cycle is shorter, a person can have a period more than once a month.

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In figure 33.2 in your textbook, which two main clades branch from the most recent common ancestor of the eumetazoans?
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