ekrisagesuepiasing ekrisagesuepiasing

19-04-2017
Biology

contestada

Normally menstruation occurs when ________.

Respuesta :

elenahutchison elenahutchison

19-04-2017

blood levels of estrogen and progesterone decrease

Answer Link

23aliviajones 23aliviajones

20-12-2019

Answer:

An egg is yet to be fertilized.

Explanation:

When an egg is not fertilized, menstruation occurs.

Answer Link

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