Which of the following can contribute to density-dependent regulation of populations?
A) the removal of toxic waste by decomposers
B) intraspecific competition for nutrients
C) earthquakes
D) floods
E) weather catastrophes
Answer: B) intraspecific competition for nutrients
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Generalized anaphylaxis is generally characterized by
A. wheal and flare. B. inflammation. C. shock. D. rash.
Hyposecretion of ADH results in
A) stimulation of protein synthesis. B) reduced uptake of blood glucose. C) diabetes insipidus. D) an increase in the mass and length of bones. E) overstimulation of cell division.
A population of hummingbirds with a variety of beak sizes finds a new food source in a plant that has a long trumpet flower with nectar at the bottom of the trumpet. Over time, these hummingbirds develop longer beaks. This is an example of
A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.
One strategy used by the petroleum industry to control souring is
a. adding nitrate to stimulate growth of nitrate reducers to outcompete sulfate reducers. b. adding sulfur-oxidizing bacteria to remove the H2S. c. adding O2 to inhibit sulfate reducers. d. both a and b