Phenylketonuria (PKU) is a _________ that can cause mental retardation.
a. chromosomal c. teratogen
b. genetic d. brain disorder
Question 2
When an infant needs to be soothed:
a. breast milk or formula is all that will work.
b. it is always a signal that he or she is in pain.
c. simply sucking on something may work.
d. a salty taste is usually preferred.