Darwin drew on the work of Thomas Malthus, a political economist, to convince his readers that:
a. there is a competition for limited resources in nature.
b. many individuals in a population do not survive to the age of reproduction.
c. only a fraction of individuals in a population reproduce.
d. None of the above.
D
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The majority of fossils are found in
a. sedimentary rock. b. Antarctica. c. peat bogs. d. tar pits. e. volcanic deposits.
The structure labeled "F" is the
a. right ventricle. b. left atrium. c. left ventricle. d. right atrium. e. superior vena cava
The region where the renal medulla is located
is indicated by a. A. b. B. c. C. d. E. e. both A and B.
Why might a racial group have fairly consistent skin colors but inconsistent alleles for the skin colors?
A. Few allele variations between groups are expected if races were genealogical species. B. Analysis of the single gene involved in skin color shows a long separation between groups. C. Skin color is polygenic and the same skin color may be produced by different gene pools. D. No relationship exists between alleles and skin color.