A number of mechanisms operate to maintain genetic diversity in a population. Why is such diversity favored?
A) Greater genetic diversity increases the chances of haploidy.
B) Genetic diversity helps populations avoid diploidy.
C) Genetic diversity may better adapt a population to inevitable changes in the environment.
D) Diversity leads to inbreeding advantages.
E) Homozygosity is an evolutionary advantage.
C
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The plasma membrane
A. is composed of an extracellular and intracellular layer of phospholipids. B. has extracellular and intracellular layers or leaflets that are highly symmetrical. C. uses cholesterol as its primary lipid. D. contains cellulose.
Materials like calcium, sulfur, iron, and many other minerals move within the plant
a. only via xylem. b. only via phloem. c. only in parenchyma. d. in parenchyma and phloem. e. in both xylem and phloem.
Men increase faster and to a greater extent than do women on similar weight training programs.
a. true b. false
Organisms that do not require oxygen for growth but grow better in its presence are called ________.
A. facultative anaerobes B. microaerophiles C. aerotolerant D. anoxygenic