1. What is the placenta?

a. An organ from which the infant receives nourishment

b. A muscular organ within which the infant develops before birth

c. The developing infant from the eighth week after conception until birth

d. The developing infant during its second through eighth week after conception.

2. Which is TRUE about neural tube defects?

a. The most common form of neural tube defect is anencephaly.

b. They include genetic disorders of the liver and kidney.

c. Higher intakes of folate in early pregnancy have resulted in decreased incidence of spina bifida in populations at risk.

d. Spina bifida is caused by an incomplete closure of the spinal cord in the vertebrae at weeks 12-16 of pregnancy.