Elana has been trying to conceive for over a year without much success. She seeks treatment from a reproductive health specialist, and finds out that her levels of progesterone are below the normal range.
Why might Elana's low progesterone levels interfere with her ability to conceive?
a. Elana may be unable to produce any eggs.
b. Elana may be unable to shed her uterine lining.
c. Elana's uterus and fallopian tubes may create a hostile environment for sperm.
d. Elana's uterus may not be able to support the implantation and survival of a fertilized egg.
Question 2
The size of the breast in non-pregnant women is related to ____.
a. the amount of fat only
b. the amount of connective tissue only
c. the amount of fat and connective tissue
d. neither the amount of fat nor of connective tissue
Large male size and mating success.
Changes in the abundance and egg-hatching success rate of prairie chickens.
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Portrait of Typical 12-year-old Boy and Girl, 1981 and 2007-2009