What are some factors that affect the blood flow through the circulatory system?

This is a type pf behavior that animals are born with and them to survive

~~16. while watching a special on animals, brianna discovers that hares tend to lose heat through their ears. based on this and what is known about surface-to-volume ratios, propose an explanation as to why hares that live in hot climates (such as the desert) have large, extended ears

Does masterbation affect height growth or loss of growth hormone?