Single celled organisms with cell walls do not have contractile vacuole suggest why?

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

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.

if you know your abc's you should be able to get your answer or just use google