Low genetic diversity a population evolve can result in extinction is not a problem with modern-day organisims is the main cause of mass extinctions

a population evolve

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;