Survivorship curves show the distribution of individuals in a population according to age
Humans and most mammals have a Type I survivorship curve because death primarily occurs in the older years. Birds have a Type II survivorship curve, as death at any age is equally probable. Trees have a Type III survivorship curve because very few survive the younger years, but after a certain age, individuals are much more likely to survive.
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"OpenStax College, Population Demography. October 17, 2013."
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