Man's forehead will grow larger because ______.A.he will make use of only about 20% of the
Man's forehead will grow larger because ______.
A.he will make use of only about 20% of the brain's capacity
B.the other 80% of his brain will grow in due time
C.he had rather narrow forehead a few hundred years ago
D.he will have to use his brain more and more as time goes on