Why are these groups specifically distinguished? What does this question mean?

The cardiovascular system, which transports blood through the body, is a one-way system. select the best answer from the choices provided. t f

True or false: determining the source and motive of an ad for a health product will you decide whether the ad is a reliable source of health information.

Hot5, endomondo, gympact, and runkeeper are popular a.) energy drinks b.) vigorous-intensity exercise c.) fitness apps d.) moderate-intensity exercise e.) fitness tests