When DDT was first introduced, insects were very
susceptible to it. The development of resistance to
DDT by insects was the result of
a. special creation.
b. natural selection of forms that expressed genes
for resistance.
c. the high biotic potential of insects.
d. a naturally occurring example of inheritance of
acquired characteristics.
e. mutation induced by DDT.
Answer: b
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Fill in the blank(s) with correct word