An elk herd is observed over many generations. Most of the full-grown bull elk have antlers of nearly the same size, although a few have antlers that are significantly larger or smaller than this average size. The average antler size remains constant
over the generations. Which of the following effects probably accounts for this situation?
A) directional selection
B) stabilizing selection
C) a bottleneck effect that resulted in low genetic diversity
D) a high rate of gene flow
Answer: B
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The conclusion from the energy flow study in Silver Springs was that
a. energy flows are difficult to measure. b. most of the sun's energy is harvested. c. only a little energy is transferred from one trophic level to the next. d. the energy flow in carnivores is equal to that of producers. e. trophic energy losses are not significant.
Which of the following is NOT classified as a type of connective tissue?
a. bone b. cartilage c. glands d. adipose e. blood
In terms of evolutionary history, which phylum contains fungi that were the first to diverge from the rest of the fungi?
a. Chytridiomycota b. Ascomycota c. Glomeromycota d. Zygomycota
What occurs when two species with very similar niches live in an overlapping range?
A. total extinction of one species B. a switch in habitat for one of the organisms C. hypervolume D. competitive exclusion E. speciation