Research conducted with six-month-old babies and the visual cliff shows that the babies ________
a. do seem to perceive a difference between the shallow side and the deep side.
b. show no reaction when placed on either side of the "cliff."
c. seem to be afraid of the "cliff" only if their mothers look scared.
d. use only monocular cues, but not binocular cues, to perceive depth.
Answer: a
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A researcher is interested in how the scores that children receive on a spelling test are affected by the amount of food that they eat for lunch. The independent variable is
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