Answer: The answer is D
Explanation: Natural selection over time can cause evolution, and is often caused by mutations.
Essential amino acids are amino acids that cannot be made by the body, and therefore must be obtained through eating cetain foods. (C)
Answer:
Option A.
Explanation:
It travels faster in part A than in B, because the distance between the earth and the sun in part A is shorter.
Answer:
b. The infant must be breathing on his or her own before you cut the cord.
Explanation:
The umbilical cord link the mother and the baby throughout the pregnancy. It consists of two arteries and a vein, which carry the nutrients and oxygen that the baby needs to develop healthily. The umbilical cord is cut after delivery so that the child begins to breathe autonomously. In general, it is cut a few seconds after the birth of the baby, when the infant begins to breathe independently.