The principal point of Darwin’s theory of evolution
by natural selection is that
a. long-term heritable changes in organisms are
caused by use and disuse.
b. mutations that adapt an organism to a given
environment always arise in the greatest
frequency in the organisms that occupy that
environment.
c. mutations are caused by all sorts of
environmental influences.
d. survival of characteristics in a population
depends on a favoring of some forms of a given
trait over others in nature.
e. mutations mostly have favorable effects.
Answer: d
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