Drugs, chemicals, and radiation that can cause birth defects are known as
a. carcinogens.
b. progestins.
c. toxoplasmosis.
d. teratogens.

Which of the following identifies the main culprit for america’s increasing weight gain?

How does stress affect the digestive system? o a. reduces ability to break down foods b. reduces acid production to slow digestion o c. increases desire for fruits and vegetables o d. increases ability to break down food submit

Why mature red blood cells has no nucleus