What biological aspects that cause one species to live longer than another species?
We’re not going to discuss about psychological aspects that contribute in longer lifespan such as stress-free environment, adequate nutrition, health care, social stimulation, living in captivity VS nature, etc. We’re going to see things from other fields/point of views.
Take this as simple example:
A small chihuahua can live far longer than a big St. Bernard since it requires less effort to sustain its heart and other vital organs, etc. A rat that is almost the size of a chi live no more than 2 years. The lifespan of an elephant could be as long as the average lifespan of human. Cold-blooded species could live longer due to decreased metabolic rate (let us ignore them for awhile and focus on mammal, for now). Etc,etc. There are many other argumentative examples that I couldn’t write all of them here.
So I want to hear your personal scientific explanation/opinions toward this matter. Please don’t just say it’s already in genetic. You could be as argumentative as you want.
This question is in the General Section. Responses must be helpful and on-topic.