Rhizarians play what important role in the environment?
a. nitrogen fixation in soils
b. bioremediation after chemical accidents
c. sequestration of carbon in their calcium carbonate shells
d. decomposition
c. sequestration of carbon in their calcium carbonate shells
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The mammalian circadian pacemaker is located in the
A. suprachiasmatic nucleus. B. brainstem. C. somatosensory cortex. D. adrenal gland. E. hippocampus.
The initial size of a population _____________ affect the carrying capacity of the environment
a. does not b. does
The luteinizing hormone
a. influences ovulation. b. has no function in males. c. is produced by the corpus luteum. d. stimulates milk production. e. promotes sperm formation.
Most of the world's deserts are located at latitudes where
A) hot, dry air moving toward the equator rises. B) hot, dry air moving toward the poles rises. C) cold, dry air moving toward the poles descends. D) cold, dry air moving toward the equator descends.