means more energy consumption therefore, some organism develop the habit of living longer instead of reproducing more to extend their species life span. So I am not so sure about the last bit of the diagram. Do species live longer to better reproduce or save energy?
I imagine the result would be the same and that's survival. You're trying to attach too much reason to it when it simply comes down to survival.
An organism that lives a long time may produce less offspring but has a chance to reproduce again and if one of those offspring's offspring reproduce we have a success story. Species like this normally would have better "reason" to adapt better to the environment. In this case mutations that extend the life of the organism might be selected.
On the other hand mayflies only live for a day almost all energy goes into reproducing. This species would produce MANY offspring. mutations that produce more offspring would be selected over ones that don't.
Both systems work. When looking at life and survival it might be better to think of it more like "Whatever works." I don't think there has to be a reason beyond that
Edited by DC85, : No reason given.