Oceans cover what portion of the earth’s surface?
a. less than 10 percent
b. more than 80 percent
c. about 50 percent
d. approximately 70 percent
e. barely 20 percent
Answer: d
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The intermediate-disturbance hypothesis predicts that the most species rich communities would contain
A. both r- and K-selected species. B. high rates of evapotranspiration. C. predominantly K-selected species. D. intermediate biomass. E. None of the answers is correct.
Surface barriers, such as cutaneous and mucous membranes, serve the immune system as the __________.
What will be an ideal response?
Which statement regarding behavior is true?
A) Innate behaviors are performed the same way in all members of a genus. B) Fixed action patterns are learned behavior sequences. C) A learned behavior triggers a fixed action pattern. D) A fixed action pattern is under strong genetic control.
The standard error tells
A. how often the examiner made an error. B. how often the experimental variable was tested. C. how uncertain a particular value is. D. the relationship between the control and test groups. E. whether or not the research has been published in a scientific journal.