Unlike early hominids, Homo sapiens had ___________________
a. a narrower pelvis
b. a shorter period of dependency
c. a slightly smaller brain
d. smaller jaws
Answer: D
Psychology
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Which of the following is a characteristic of both light waves and sound waves?
a) hue b) decibels c) amplitude d) wavelength
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According to the Yerkes-Dodson law, optimum performance on tasks which are simple and direct occurs at levels of arousal that are
a. higher than normal. b. lower than normal. c. moderate. d. almost zero.
Psychology