https://journals.sagepub.com/doi/abs/10.1177/074873049701200205 … very weird: nonhuman primate lives 9-10 seasonal photoperiod cycles (days getting short and then long again) and if you speed up those cycles its lifespan drops 30%. If you slowed down the photoperiod cycle could you *increase* lifespan?!
Changing environments require adaptation, so we need generational change. Food supply is limited, so we need to make sure we don't outcompete the grand children. Look at a species not from the perspective of a set of organisms at one moment in time, but integrate over generations