Cro-Magnon populations were characterized by:
A. broad, small faces
B. B.Prominent chin
C. large cranial capacities
D. all of these
D. all of these
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Which of the following is an example of how industrial production of farming has led to a decline in the number of varieties of crops?
a. The availability of meat resources has decreased over time. b. By the 1990s, only six varieties of corn accounted for 46 percent of the crop. c. The variety of soy products has decreased over time. d. The availability of resources to grow more varieties of crops has decreased over time.
Gene flow is defined as the
a. production of new alleles. b. production of new genetic material. c. chance loss of alleles in a population. d. exchange of genes between populations. e. differential reproductive success of individuals.
Ultraviolet radiation can be an important factor in selection for increased melanin production because UV radiation can cause
a. rickets. b. albinism. c. skin cancer. d. the destruction of foliage. e. drought.
________ involves a separation and isolation of populations of the parent species.
A. Speciation B. Allopatric speciation C. Phyletic gradualism D. Punctuated equilibrium