Different kinds of living things have different
lifespans. Some trees - cherry and peach trees,
for example - have livespans about like what
humans have. The very longest-lived pines and
redwoods can live for several thousand years.
For us humans, our organs fail after about 60-80
years. Why they fail is still being studied (in
fact, there is probably more work being done on
that than anything else in science...).
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