Human development from conception to birth is divided into three trimesters. The most
Chapter 27, Problem 27.16(choose chapter or problem)
Human development from conception to birth is divided into three trimesters. The most rapid changes occur during the first trimester. At 9 weeks, the embryo is called a fetus. The second and third trimesters are times of growth and preparation for birth.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer