Which of the following has a ventral nerve cord?
A) Shark
B) Frog
C) Coelacanth
D) Earthworm
E) Hummingbird
D
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The probable extinction of the ivory-billed woodpecker was mainly driven by
A. direct exploitation. B. introduced species. C. habitat destruction. D. climate change. E. genetic drift.
In a Hardy-Weinberg equilibrium, as the frequencies of homozygous genotypes increase, the frequency of the
heterozygous genotype _____. a. doubles b. is reduced by a factor of 10 c. increases linearly d. decreases linearly e. remains the same
The shape of the bill on the bird in Figure 37-2 is most likely the result of:
a. coevolution.
b. pollination.
c. asexual reproduction.
d. pseudocopulation.
e. inbreeding.
Any substance that triggers an immune response in the body is called a(n) ________
A) memory cell B) MHC marker C) complement D) antigen