The change in man's size of forehead is probably because ______.A.only 20 % of the brain's
The change in man's size of forehead is probably because ______.
A.only 20 % of the brain's capacity is being made use of
B.his brain has grown larger over the past centuries
C.the other 80% of his brain will grow in due time
D.he will use his brain more and more as time goes on