__________ fights infection by increasing the
metabolic rate. Fill in the blank(s) with the appropriate word(s).
Answer: Fever
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Does this experiment support the conclusion that prairie dogs are a keystone species?
a. Yes, because once they recovered other populations declined. b. Yes, because they tracked the recovery of grasses and forbs. c. Yes, because once prairie dogs recovered other population levels tracked their recovery. d. No, the experiment refutes the conclusion that prairie dogs are a keystone species.
Which structure, A, B, C, or D, returns nearly all nutrients to the interstitial fluid?
1.A
2.B
3.C
4.D
The ultimate source of all energy in a
terrestrial ecosystem is a. the organic matter in all the organisms of the ecosystem. b. electrons from water molecules. c. sunlight. d. ATP. e. inorganic mineral ions in the soil
The Galápagos Islands are inhabited by 13 species of Darwin's finches that evolved from a single species. This is an example of
A) clinal variation. B) adaptive radiation. C) directional selection. D) genetic drift.