Mostly it comes down to the fact that as much smaller organisms, it takes less time for them to grow to pull maturity and start reproducing themselves. And after reproducing there is less incentive to continue to exist.
There are exceptions to this though. Cicadas can live a couple of decades underground before emerging in their final form to breed and die.
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Mostly it comes down to the fact that as much smaller organisms, it takes less time for them to grow to pull maturity and start reproducing themselves. And after reproducing there is less incentive to continue to exist.
There are exceptions to this though. Cicadas can live a couple of decades underground before emerging in their final form to breed and die.
A good rule of thumb for most animals is a 1 billion heartbeat life span.