A blood fluke infection is most likely to be found in persons who
a. eat undercooked beef.
b. walk barefoot in a rice field.
c. eat undercooked pork.
d. are bitten by mosquitoes.
e. eat undercooked fish.
B
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Northern elephant seals (Mirounga angustirostris) come up on a beach during breeding season. Males arrive first and establish a territory by posturing and fighting with other males. The posturing and fighting behaviors are probably the result of _________
A. intrasexual selection B. intersexual selection C. competition D. kin selection E. group selection
The first steps in glycolysis involve
A. reducing glucose. B. both the addition of two phosphates to glucose, and then splitting glucose. C. adding two phosphates from ATP to glucose. D. splitting glucose into two, 3-carbon molecules. E. generation of ATP.
Which of the following is true concerning the
hybrids produced by parapatric speciation? a. They are more fit than individuals on either side of the contact zone. b. They appear commonly on either side of the contact zone. c. They are more likely to breed on either side of the contact zone. d. They are selected against in the contact zone. e. They are less fit than individuals on either side of the contact zone.None of these is true.
Evidence suggests that the crocodiles are more closely related to the birds than the turtles and snakes. If so, then including crocodiles, but not birds, in the Class Reptilia would make the Class Reptilia
A. not homologous. B. a polyphyletic group. C. parsimonious. D. a monophyletic group. E. a paraphyletic group.