Which part of the immune system is a physical barrier? a. skin b. tears c. mucus d. stomach acid

If babies are consistently placed on their backs without any restrictions, what will happen to their development? a. they suffer from weakness in certain muscle groups. b. their ability to roll over, crawl, and eventually walk is hindered. c. they suffer brain damage from the pressure on the back of the head. d. they learn to roll over, crawl, and eventually walk on their own.

Acne is caused by a. a strict diet b. eating at night c. hormones d. dry skin select the best answer from the choices provided. a b c d

What is known about the genetics of diabetic disorders? what goes wrong when juvenile diabetes sets in?