The rate of teen pregnancy continues to climb over the past several years in the United States of America

In many modern hospitals, the blood of newborn infants is routinely screened for high levels of

A) phenylalanine. B) phenylpyruvic acid. C) phenylalanine hydroxylase. D) all of the above E) both B and C

The midday napping practices of "siesta cultures" are adaptive because the siesta allows individuals

a. a necessary break from their extremely physical labor. b. to sleep at the same time as their young infants. c. time to digest their large midday meal. d. to avoid working during the hottest part of the day.