The BAT is the mammal that retains its embryo in its uterus for the full term of the pregnancy.
Both the Koala and the Kangaroo give birth to their young after only a month but their young stay within their mother's pouch and continue to develop until they are 1 to 2 years of age.
Answer:
It is how something has been developing/developed over a certain time period starting off simple to become something composite. It has an advancement or growth to it. In other words it is something that progresses throughout time and has a change in transformation.
Aldosterone from the adrenal gland is the answer
On the earth, down means toward the earth's center.