In a species, what is required for a new sensory adaptation to evolve by natural selection?
A) Individuals that needed this trait mutated a sensory receptor to create the new adaptation.
B) Individuals that possessed this trait produced more offspring than those that did not possess the trait.
C) Individuals that possessed this trait survived by chance, and passed on the trait to their offspring.
D) Individuals immigrated to a new area, and brought the trait with them.
B
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A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleolus. B. cell. C. nucleus. D. plasma membrane.
Coniferous forests are found in all of the following locations EXCEPT
A. the Pacific coast of North America. B. northern Africa and the extreme southwestern United States. C. coastal areas of the southeastern United States. D. the northern part of North America and Eurasia.
Suppose in an attempt to estimate the effect of how listing with a real estate agent impacts a house's selling price you estimate the following regression: Pricei = 10.2 (3.2) + 2.3 (0.8) Agent + -2.9 (0.3) Distance to Downtowni, where Distance to Downtown is a proxy variable, which can be used to control for the desirability of the location, and the standard errors for each coefficient are reported in parenthesis. How should we interpret the regression results for the coefficient on Agent?
A. The unconditional correlation between whether a listing is listed with an agent and how far it is from downtown is negative. B. Listings with an agent sell for higher prices holding fixed the desirability of the location of the listing. C. The unconditional correlation between housing prices and house sales with a listing agent are positive. D. None of the answers is correct.
If a drug is tested for harmful side effects and the results show no statistically significant side effects in the study, then it is definitely safe to use this drug
a. true b. false