Which of the following foods would be least likely to contribute to the development of heart disease?
A) margarine
B) butter
C) bacon
D) fish oil
Answer: D
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Kin selection is a form of natural selection in which ____
a. dominant individuals share resources disproportionately with their close relatives b. individuals help relatives only if they are likely to return the favor in the future c. group members sacrifice their own reproductive success to help individuals who are not their direct descendants d. shared alleles for altruism are perpetuated if the assisted animals produce more offspring than the helper could have produced if he had not helped e. shared alleles for altruism are perpetuated if the helper produces more offspring than the relatives that he aids
Evaporation exerts tension on the narrow columns of water that fill xylem tubes. The tension occurs because liquid water has ____
a. cohesion due to hydrogen bonds b. cohesion due to ionic bonds c. translocation of sugars d. pressure due to compression within xylem e. high oxygen content due to soil conditions
Alcohol acts as a(n) ___ on the central nervous system.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements best describes the true nature of natural selection?
A) Only the strongest survive. B) The strong eliminate the weak in the race for survival. C) Organisms change by random chance. D) Heritable traits that promote reproduction become more frequent in a population from one generation to the next.