Professor Flummox gives her new test of aptitudes for studying psychology to her psychology students at the start of the year. At the end of the year, she finds that those who did well on the test averaged only a "C" in the course. The test lacks .

the answer is design

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

i believe is what you're looking for?

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.  

answerkingdom is the largest cateagory