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Standards Index: LS4.B: Natural Selection

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  • Natural selection occurs only if there is both (1) variation in the genetic information between organisms in a population and (2) variation in the expression of that genetic information—that is, trait variation—that leads to differences in performance among individuals.
  • The traits that positively affect survival are more likely to be reproduced, and thus are more common in the population.
Image from The Birth of the Environmental Movement: DDT and Rachel Carson
Video

The Birth of the Environmental Movement: DDT and Rachel Carson

Students will learn how the U.S. government came to develop environmental protection policies and what that means today as we struggle to balance the risk between pesticides and disease.