Which of the following can result in speciation
within a few generations?
a. development of a physical barrier
b. polyploidy arising in a plant species
c. postzygotic isolating mechanisms
d. change in environmental conditions
e. the introduction of a new predator into an
area
B
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Which of the following statements does NOT describe an attribute of conifer resin?
A. It hardens on contact with air. B. It forms amber. C. It traps insects and other organisms. D. It is an antibiotic and prevents infections. E. It flows through ducts in the wood and leaves.
Which of the following is the main point of the study of guppies in Trinidad? a. Predators can affect life history patterns
b. Killifish and cichlids eat guppies. c. Guppies that share habitat with killifish grow faster. d. Life history patterns immediately return to normal once predators are removed.
How do Ctenophora differ from Cnidaria?
a. They have a true coelom. b. They are non-motile. c. They have rotation symmetry. d. They have bi-radial symmetry.
Generally, the first antibody class made upon a primary antigen exposure is
A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.