Ecologist James H. Brown of the University of New Mexico has addressed species composition and richness in
experiments conducted since 1977 in the Chihuahuan desert of southeastern Arizona. In one experiment, the removal of
three dominant species, all kangaroo rats, from several plots resulted in an increased diversity of other rodent species. This
increase was ascribed both to lowered competition for food and also to an altered habitat, because the abundance of grass
species ____ after the removal of the kangaroo rats.
a. increased
b. decreased
c. did not change
d. was threatened
e. shrunk
a
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Approximately what percentage of our planet's land area is covered by crop and pasture lands?
A. 25% B. 5% C. 10% D. 50% E. 60%
A parent cell of a certain organism has 16 chromosomes and undergoes meiosis. The resulting cells will have how many chromosomes?
a. 64 b. 32 c. 16 d. 8 e. 4
Strong selection against the phenotypes for both homozygotes
a. reduces the equilibrium frequencies of the homozygous genotypes b. completely eliminates the homozygous genotypes c. has no effect on the homozygous genotypes
Structural features which contain proteins that
help to control the shape of cells are
a. plastids. b. vacuoles. c. microtubules. d. nucleoli. e. microfilaments