The tables below demonstrate the survival rate of humans throughout time. This table demonstrates the survival rate of a species over time. Humans tend to live a longer time and die off rapidly near 70 to 80 years. In contrast a type of tree such as an oak will have a quick die off period initially and only a few will survive the longrun.
As you can see most humans survive early on, once the time gets to about 80 years the line tapers off quickly.
Another interesting chart I discovered compares the population life tables of humans over a couple centuries. you can see the drastic effects of health and well being over the past couple hundred years.
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