How much of vegetables are you supposed to eat per day?

Which one of the following causes people to go through a cycle of losing weight, gaining it back, then lose it again

Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition select the best answer from the choices provided

Why does the body need calcium and what are the symptoms of calcium deficiency?