blood flows at a high pressure, so if the arteries are thin and less muscular, the arteries can explode due to the pressure. so it needs thick and muscular properties so that it can withstand the increasing pressure of the flow of blood.
im not sure why it needs to be elastic. Hope it helped :)
Answer:
A was the answer to mine but u didn't post your diagram so I don't know
Explanation:
three domains , archae- 1st appeared, prokaria- not closed by nucleus and eukaria closed by nucleus
I think its C. global warming
because the other one directly threats aquatic bio diversity while global warming doesn't just affect aquatic biodiversity
