Which of the following maintains the endometrium in preparation for pregnancy?

a. oocytes
b. LH
c. estrogen
d. FSH
e. progesterone


ANSWER: e

Biology & Microbiology

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Which of the following is a grouping of related genera?

a. family b. phylum c. species d. class e. order

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Air enters the lungs when the diaphragm ________.

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The principle sites of amphibolic interaction occur during

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