How much larger are the brains of Homo sapiens than the brains of the Homo species that immediately preceded us?
a. 10%
b. 30%
c. 50%
d. 70%
B
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Which of the following can prompt an electrically gated ion channel in the cell membrane to open?
A. activity of the sodium-potassium pump B. one additional ion entering the cell C. one ion leaving the cell D. a change in the electrical potential of the membrane
Which of the following is not true?
a. Fraternal twins develop during mitoses. b. It is possible for fraternal twins to have different fathers. c. Fraternal twins are produced when two separate ova are fertilized in a month. d. Fraternal twins are as generically alike as any two siblings.
Explain why Latinos are one of the least likely ethnic groups in America to seek a physician's help when they are ill.
What will be an ideal response?
Which statement is among the conclusions supported by the research on imitation?
A. Newborn chimpanzees imitate more facial expressions and gestures than human infants, and their imitative behavior does not decline. B. Imitation is harder to induce in newborns than in babies 2 to 3 months old because newborns cannot learn by observing others. C. Babies several months old often do not imitate an adult's behavior right away because they first try to play familiar social games. D. Unlike newborn chimpanzees, newborn humans cannot imitate certain gestures, such as head and index-finger movements.