Which of the following is a way that allopolyploidy can most directly cause speciation?
A) It can improve success in island habitats.
B) It can overcome hybrid sterility.
C) It can change the mating behavior of animals.
D) It can generate geographic barriers.
E) It can produce heterochrony.
Answer: B) It can overcome hybrid sterility.
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Nearly all dinosaurs became extinct as a result of direct competition with mammals
A. true B. false
Nematocysts are found only in
a. cnidarians. b. nematodes. c. crustaceans. d. echinoderms. e. sponges.
What fraction of all of the organic carbon on Earth results from microbial fixation of carbon dioxide in the oceans?
A. About 1/4 B. About 1/2 C. About 3/4 D. About 1/8
A organism's "trophic level" refers to:
a. where it lives b. the rate at which it uses energy c. whether it is early or late in ecological succession d. the intensity of competition with other species e. its food source