Behind the first whisker in boys and the widening of hips in girls is a flood of _____, powerful chemical substances secreted by the endocrine glands and carried through the body by the bloodstream.
A. amino acids
B. phospholipids
C. enzymes
D. hormones
Answer:D
Behind the first whisker in boys and the widening of hips in girls is a flood of _____, powerful chemical substances secreted by the endocrine glands and carried through the body by the bloodstream.
A. amino acids B. phospholipids C. enzymes D. hormones