Answer:
B, a day would be exactly the same as a year.
Explanation:
I <em>think</em><em> </em>that it would mean that a day would be exactly the same as a year (B).
Answer:
The first alligator ancestors evolved about 245 million years ago.
Explanation:
The first alligator ancestors evolved about 245 million years ago due to change in the environmental condition. crocodilians appeared about 80 million years ago during the Cretaceous period. Modern alligators has experience less changes which is closely related to their ancient ancestors and look much like to their relatives that exists about 80 million years ago. The main reason for the change in the body structure of alligator is due to change in environmental condition.
Answer:
B) blood levels of estrogen and progesterone decrease
Explanation:
Menstruation is a normal phenomenon in a fertile female. It is the biological process whereby the flow of blood from the uterine lining occurs. Menstruation usually occurs after implantation, which is the attachment of a fertilized egg in the uterus, fails to occur.
On a monthly basis, the female reproductive organ prepares the uterus for implantation, which is physiological stimulated by an increase in the blood levels of estrogen and progesterone. However, when there is no implantation, the level of these two reproductive hormones (estrogen and progesterone) fall, and menstruation is stimulated to occur.