Male deer have large antlers that are used to challenge each other in fights for territory and females. The females of this group actively choose the strongest males. Which type of sexual selection is occurring with the deer population?
A. Stabilizing selection.
B. negative frequency-dependent selection.
C. Intersexual selection.
D. Intrasexual selection.
E. Intersexual and intrasexual selection are both occurring.
E. Intersexual and intrasexual selection are both occurring.
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The enzyme that catalyzes the addition of new nucleotides to a growing DNA strand is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
Diatoms are used for four of the following. Which one is the exception?
a. biofuels b. ink c. filters d. cleaners e. insecticides
Nitrogen-fixing bacteria convert gaseous nitrogen into:a
amino acids. b. phosphate. c. ammonia. d. nitrite.
e. nitrate.Carrying capacity is
A) seldom reached by marine producers and consumers because of the vast resources of the ocean. B) the maximum population size that a particular environment can support. C) fixed for most species over most of their range most of the time. D) determined by density and dispersion data. E) the term used to describe the stress a population undergoes due to limited resources