• Population growth is the change in the size of the population over time.
  • An important factor in population growth is age-sex structure.
  • This is the number of individuals of each sex and age in the population.
  • Younger people are more likely to reproduce, while older people have higher rates of dying.
  • Survorship curves reflect death rates at different ages.
  • The three types of curves shown in the figure actually represent different strategies species use to adapt to their environment.
  • The Type I strategy occurs more often in stable environments, while the Type III strategy is more likely in unstable environments.
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