Why different organisms have different lifetimes?

Question

If all organisms are carbon based and and have almost similar functions(cellular etc.), why does lifetime vary across species, demographics etc.

*Lifetime here is average natural lifetime.

In: Biology

Answer 1

the more likely an organism is to die from predation the less likely any genes relating towards longevity will matter.

for instance, bats and rats/mice are similar in size, but because of their ability to fly bats have a much lower chance of actually being eaten, which means they have a much larger chance of reproducing later on in their life which will benefit bats with better genetics relating towards longevity.

TLDR;