Author Question: At birth, the human brain is approximately what percent of its adult size? a. 50 percent b. 75 ... (Read 142 times)

Mimi · **on:** Aug 11, 2018

At birth, the human brain is approximately what percent of its adult size?

a. 50 percent
b. 75 percent
c. 15 percent
d. 100 percent
e. 25 percent

Question 2

Why are polychlorinated biphenyls toxic to humans? All of the following are consequences except:

a. They weaken the immune system.
b. They cause liver damage.
c. They cause brain damage to children exposed in the womb.
d. They cause skin cancer.