Would water (h2o) be an example of an element, a mixture, a compound, or at atom?

What food can provide the body with a quick source of the energy needed to carry out cell functions (a) whole grain bread (b) ground hamburger (c) vegetable oil (d) whole milk

Why do bacteria thrive even in hostile environments

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine