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ARC-Easy / MCAS_1999_8_23 / Five hundred flies of one species were sprayed with a new insecticide.…

Problem

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question

Five hundred flies of one species were sprayed with a new insecticide. Twenty-four hours later, nearly all the flies were dead. However, a few survived. Which principle best explains why some flies survived?

choices

  • Animals adapt to new environments.
  • New species develop from survivors.
  • There is variation among individuals within a species.
  • Insecticides may cause genetic mutations.

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Source and history

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