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28. Natural selection causes
a. changes in the environment
b. plants and animals to produce more offpsring than can survive
c. changes in the frequency of certain favorable characteristics in a population
d. all of the above

30. When Darwin published his theory of evolution, he included all of the following ideas EXCEPT the idea that
a. species change slowly over time
b. some organisms become less suited to their environment than others
c. evolution occurs in spurts after major environmental change
d. some organisms reproduce at a greater rate than others
A or D?


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