A deficiency in maternal levels of _____ during early pregnancy has been linked to a risk for neural tube disorders
a. vitamin A
b. calcium
c. folic acid
d. iron
c
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The eye muscles can be moved with greater precision than the biceps muscles because ____
a. biceps have only slow-twitch muscles b. biceps have only fast-twitch muscles c. biceps are opposed by an antagonistic muscle; the eye muscles are not d. eye muscles have a lower ratio of muscle fibers to axons
How many of these items could be elements of someone's life story: emotions, main characters, and a legacy?
a. none b. one c. two d. three
Which of the following are probably vestigial structures, which have no apparent function but may have had some function in our ancestors?
a. milk teeth c. molars b. wisdom teeth d. secondary teeth
Z-scores can be calculated from
a. any data. c. nominal or ordinal scores. b. interval or ratio scores. d. the range.