Refer to the accompanying figure with the lateral line organs of fishes. The structures indicated by label 1 are:
a. hair cells.
b. cupula.
c. stereocilia.
d. sensory neurons.
e. supporting cells.
e
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To Alexander Agassiz are attributed the following theories except:
a. colors of organisms were related to the absorption of different wavelengths of light at different depths. b. that the Caribbean and Pacific Oceans were once connected. c. that atolls form atop sinking mountains. d. none of the above
Oxygen moves from alveoli to the bloodstream ____
a. because the concentration of oxygen is greater in alveoli than in the blood b. mainly due to the activity of carbonic anhydrase in the red blood cells c. against a concentration gradient d. to equal the concentration of CO2 in the blood e. by active transport
Many male birds learn the full species song
a. 10 to 50 days after hatching. b. by listening to other birds sing. c. while in a flock of juveniles being tutored by older males. d. within 50 days after hatching and by listening to other birds sing. e. 10 to 50 days after hatching and while in a flock of juveniles being tutored by older males.
Biogeochemical cycles are crucial to ecosystem function because __________.
Fill in the blank(s) with the appropriate word(s).