Which of the following statements about human evolution is correct?
A) Modern humans are the only human species to have evolved on Earth.
B) Human ancestors were virtually identical to extant chimpanzees.
C) Human evolution has occurred within an unbranched lineage.
D) The upright posture and enlarged brain of humans evolved separately.
D
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How does the ear allow humans to distinguish the volume of different sounds?
A) Louder sounds cause larger action potentials than do softer sounds. B) Louder sounds cause smaller action potentials than do softer sounds. C) Louder sounds induce a higher frequency of action potentials than do softer sounds. D) Louder sounds induce a lower frequency of action potentials than do softer sounds. E) Louder sounds cause larger action potentials than do softer sounds, and louder sounds induce a higher frequency of action potentials than do softer sounds.
Charles Darwin and Alfred E. Neumann co-developed the theory of evolution by natural selection.
Indicate whether the statement is true or false
When molecules are broken apart in respiration, ____
a. the heat produced is used to drive biological reactions b. the oxygen in the compounds that are broken apart is used as an energy source c. the energy released is channeled into molecules of ATP d. ATP is converted into ADP e. ADP is released as a waste product
Which of the following diseases is NOT caused by a Rickettsia species?
a. human monocytic ehrlichiosis b. Rocky Mountain spotted fever c. typhus d. Q fever