Why do people who exercise more produce more carbon dioxide ?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

This drawing shows a human body system. what is the primary function of this body system?