Lifespan is correlated with the time it takes to reproduce. If a species needs a lot of time to reproduce, then only the individuals who live longer will procre

Lifespan is correlated with the time it takes to reproduce. If a species needs a lot of time to reproduce, then only the individuals who live longer will procreate, passing down the genes of long life. On the other hand, if it is too quick to reproduce, genes for short lifespan will abound, pressuring the shorter lifespans across the population.