Billy often teases and picks fights with other children. Billy is showing

Which of the following statements is supported by research on group differences in IQ?

A) On average, Hispanic children score slightly lower than African-American children on measures of IQ. B) Heredity is largely responsible for individual, ethnic, and SES variations in intelligence. C) Differences in SES do not fully explain the IQ gap between black and white American children. D) Differences in SES are primarily responsible for the IQ gap between black and white American children.

Rex describes a period of the lifespan as "the time when primitive organ systems mature and become functional." The period he is describing would correctly be identified as:

a. the germinal period b. the fetal period c. the embryonic period d. the viability period