• Populations may show different patterns of growth.
  • Growth pattern depends partly on the conditions under which a population lives.
  • Under ideal conditions, populations of most species can grow at exponential rates.
  • Most populations do not live under ideal conditions and grow logistically instead.
  • Many factors may limit growth.
  • Often, the factors are density dependent (known as density-dependent factors) These are factors that are influential when the population becomes too large and crowded.
  • Population growth hits a ceiling at that size in the logistic growth model.
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