What substance provides energy or helps form body tissues?

A. Nutrition
B. Nutrient
C. Carbohydrates
D. Proteins

Microorganisms aren’t all decomposers; in fact, many act as producers or primary consumers in an ecosystem. how do microorganisms that act as producers benefit the rest of an ecosystem in terms of energy transfer? what about microorganisms that act as primary consumers?

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

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