Which of the following types of plants are incapable of self-pollination?
A) dioecious
B) monoecious
C) wind-pollinated
D) insect-pollinated
A
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Instantaneous speciation (select all correct choices)
A. is, by definition, a type of sympatric speciation. B. is typically caused when hybridization between species produces fertile, viable offspring that are reproductively isolated from both parental species. C. often involves the multiplication of chromosome sets, or polyploidy. D. is relatively common in plants but not in animals. E. none of these
The tree line in alpine areas is often determined by a combination of
A. wind and water. B. water and soil type. C. salts in the soil. D. low temperatures and high winds. E. high temperatures and high winds.
The largest reservoir of carbon is
a. consumers. b. nutrients in soil. c. producers. d. rock. e. water.
A condition in which wheezing occurs with breathlessness and a persistent cough, and yields yellowish or greenish phlegm is
A) asthma. B) bronchitis. C) lung cancer. D) lupus. E) anemia.