Over the past century, sagebrush has dramatically expanded its range over the Colorado plateau's grasslands. This development has been attributed to the overgrazing of the area's grasses by cattle and sheep. This example indicates that
A) sagebrush could not exist anywhere in the absence of cattle and sheep.
B) grazing has no effect on the distribution of plants.
C) the relationship between sagebrush and grasses is mutualistic.
D) the range of sagebrush is normally limited by competition with grasses.
E) sagebrush is the dominant competitor over grasses.
D
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The life history of an organism takes into account:
A. whether the organism is an r-strategist or K-strategist. B. what type of survivorship curve the organism demonstrates. C. the resource trade-offs that the organism makes during its lifetime. D. the age structure of the organism's local population. E. the evolutionary history (i.e., ancestors) of the organism.
Release of leptin by fat cells and the firing of the stretch receptors of the stomach will stimulate the satiety center of the brain.
True or False
Which of the following processes does NOT
serve to maintain low pressure at the receiving end of sieve tube pipelines? a. sucrose conversion into cell-wall polysaccharides b. sucrose conversion into starch in the receiving regions c. sucrose conversion to glucose, which is then used in cellular respiration d. activity of companion cells e. conversion of sucrose to fructose in fruits
Paramecia use cilia for locomotion and for gathering organic matter. How are rotifers similar?
A. Rotifers and ciliates are thought to have given rise to all other animal phyla. B. The corona is made of cilia, and used for swimming and feeding. C. Both lack a gut. D. Rotifers are single-celled protists.