Ultrasound shows that
a. fetuses have no preference for handedness.
b. a majority of fetuses suck their left thumbs.
c. about 95% of fetuses suck their right thumbs.
d. fetuses suck both right and left thumbs equally.
c
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Which of the following statements is true about speech perception?
A) Not until the end of the second year can toddlers "screen out" sounds not used in their native tongue. B) Between 6 and 8 months, babies start to "screen out" sounds not used in their native tongue. C) Young infants listen longer to nonspeech sounds than to human speech. D) Newborns prefer speech that is fast, low-pitched, and monotone.
One of the main differences between natural killer cells and T cells is that natural killer cells ____.
A. attack normal tissue B. attack several kinds of intruders C. are cancer cells D. are more specific in their targets