• Coevolution occurs when species of organisms change in response to a change in the environment.
  • As one species changes, the other species must also change in order to adapt.
  • Flowering plants depend on insects for pollination, so have evolved colors, shapes, scents that are attractive to certain insect species.
  • Insects, in turn, have evolved mouthparts, senses, and flight patterns that allow them to benefit from specific floral “offerings,” shown in the Figure below.
  • The endosymbiotic theory describes a special form of co-evolution.
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