• Population is a group of organisms of the same species that live in the same area.
  • The size of a population may be less important than its density.
  • Often, individuals in a population are not spread out evenly.
  • Instead, they may live in clumps or some other pattern.
  • The pattern may reflect characteristics of the species or its environment.
  • Population size influences the chances of a species surviving or going extinct.
  • Generally, very small populations are at greatest risk of extinction.
  • How large a population is and how fast it is growing are often used as measures of its health.
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