Which acts as both a physical and chemical barrier against pathogens? skin lymph blood mucus

Which is an example of a food group? a. oils b. vegetables c. water d. sweets

Why is it so important to have a lifetime commitment to training? a-it takes your entire life to become fit b-it keeps you from becoming bored c-you will lose strength and endurance once you stop exercising d-it increases your motivation in life

When lifting heavy loads off the ground, the majority of the weight should be lifted by which of the following? a. arms b. legs c. back d. stomach