Compared to a solution of pH 9, a solution of pH 7 is
A. 20 times more basic.
B. 20 times more acidic.
C. 100 times more acidic.
D. 2 times more acidic.
E. 100 times more basic.
Answer: C
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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.
The least numerous but largest of all agranulocytes is the:
a. basophil b. lymphocyte c. monocyte d. neutrophil
What structure is responsible for the exchange of gas in leaves?
a. Aerenchyme b. Propagule c. Lenticels d. Stomata
Animals that possess both male and female sexual organs
a. are parthenogenetic and typically self-fertilize. b. are hermaphroditic and typically self-fertilize. c. are dioecious and typically cross-fertilize. d. are dioecious and typically self-fertilize. e. are hermaphroditic and typically cross-fertilize.