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1. The primary purpose of the passage is to
(E) summarize a number of scientific theories that attempt to explain why animal populations do not exceed certain limits ="Although numbers of animals in a given region may fluctuate from year to year, the fluctuations are often temporary and, over long periods, trivial. Scientists have advanced three theories of population control to account for this relative constancy."
2. It
...
1. The primary purpose of the passage is to
(E) summarize a number of scientific theories that attempt to explain why animal populations do not exceed certain limits ="Although numbers of animals in a given region may fluctuate from year to year, the fluctuations are often temporary and, over long periods, trivial. Scientists have advanced three theories of population control to account for this relative constancy."
2. It
...
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