I believe the answer would be the cell address.
Hope that helped!
Answer:
hope it helps..
Explanation:
During the third trimester, the fetus continues to grow in size and weight. The lungs are still maturing. The fetus starts to position itself head-down. By the end of the third trimester, the fetus is about 19 to 21 inches long and weighs about 6 to 9 pounds.
Answer:
The amniotic sac and its filling provide a liquid that surrounds
and cushions the fetus . It is a site of exchange of essential
substances, such as oxygen, between the umbilical cord and the
fetus. It allows the fetus to move freely within the walls of the
uterus. Buoyancy is also provided
The experiment that led to changes to the original cell theory ARE THE EXPERIMENTS THAT SHOWED THAT ALL CELLS ARE SIMILAR IN HOW THEY METABOLIZE AND IN THEIR COMPOSITION.
Scientists always update existing theories to reflect new emerging scientific facts and this was what happened to the cell theory. Some changes were made to the theory when it was discovered that all cells are identical when it comes to composition and metabolism.
Hope this helps :)