The nervous system is to a telephone as the endocrine system is to a
a. chemical message.
b. television set.
c. hormone.
d. radio broadcast.

According to the national health and safety standards: guidelines for out-of-home care, what is the proper adult-to-child ratio for children younger than one year? a. one adult to one child b. one adult to two children c. one adult to three children d. one adult to four children