If the parameter for the squared term is negative, natural selection will likely stabilize the phenotype at an intermediate value.
a. true
b. false
Answer: a. true
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Well-developed vascular systems are absent in all of the following except
A. mosses. B. liverworts. C. hornworts. D. Charophytes. E. Pterophytes.
Which factor(s) is (are) contributing to the increase in the spread and occurrence of many diseases?
a. International travel b. Overuse of antibiotics c. Misuse of antibiotics d. An increase in the population e. All of these
Describe the steps in the polymerase chain reaction (PCR). What will be an ideal response?
How does humidity affect the body's temperature-regulating mechanisms?
a. high humidity reduces evaporative cooling b. the need for fluid replacement decreases as humidity increases c. low humidity improves convective cooling d. sweating increases as humidity decreases