Which of the following organisms needs salt in it’s environment to survive a)squirrel b)shark c)frog d)cactus

B is the answer. Sharks need salt water to survive to make the breathing and blood pump through their bodies.

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

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.