Because when exercising your heart pumps more blood to your body and
it has more space to fill so it beats faster
Mutualism is the only symbiosis because it benefits both species.
Hi!
Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease, which typically happens in a small proportion of infected people, occurs when the cells in your body are damaged as a result of infection, and signs and symptoms of an illness appear.
I believe the answer is A. because once the allele changes the future populations will change along with it... hope i helped !