What triggers puberty in a boy's life?

Total per-capita consumption of alcohol

A. has increased steadily since 1965. B. has remained relatively constant over the past 40 years. C. increases and decreases about every five years. D. has declined considerably from its peak in 1981

Scores on the Bayley Scales of Infant Development ___________________

a. are useful as a screening tool because those who score very low may have developmental problems b. are predictive of later IQ or school performance c. are no longer used because they are considered out of date d. are calculated for use with children ages 3 months to 9 years