Answer the following question given this paragraph: 

The main function of the cardiovascular system is transporting substances around the body. Figure above shows some of the substances that are transported in the blood. They include hormones, oxygen, nutrients from digested food, and cellular wastes. Transport of all these materials is necessary to maintain homeostasis of the body and life itself.


Q: What is the main function of the cardiovascular system?

 Choices:

- respiration of air

- excretion of food waste

- coordinate bones and muscles

- transporting substances around the body

A:
transporting substances around the body
