Root hairs are most important to a plant because they _____
A) anchor a plant in the soil
B) store starches
C) increase the surface area for absorption
D) provide a habitat for nitrogen-fixing bacteria
E) contain xylem tissue
Answer: C
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Capillary waves are small
Indicate whether the statement is true or false
For statements 117–121 select the best choice of the four
evolutionary processes listed below. a. mutation b. gene flow c. genetic drift d. natural selection M 117. This is most likely to lead to the loss of genetic variation in a small population. E 118. This process produces new genetic variation within a species. M 119. This process can rapidly offset the effects of genetic isolation when two populations come into secondary contact. M 120. The reduced contribution of one phenotype in comparison to another to the next generation is an example of this. M 121. The occurrence of mimicry is best explained as the ultimate result of this process.
The sense of euphoria from low doses of barbiturates is chiefly due to __________.
A. an inhibition of the respiratory centers in the medulla B. a disinhibition of the cerebral cortex C. an inhibition of the reticular formation D. an excitation of the limbic system
Which of these people is most likely to have kidney trauma in an accident?
A) an obese older individual B) an elderly person with almost no body fat C) a person of average weight D) an obese younger person