Select the correct statement about the uterine cycle.
during the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone.
the menstrual phase of the cycle is from day 1 to day 8.
during the secretory phase, estrogen levels are at their highest.
if fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

and i oop

explanation:

if you know your abc's you should be able to get your answer or just use google

yes

explanation

they do and it slaps