Do carbon dioxide and methane affect energy ENTERING or EXITING the earth's system? Pick one ENTERING or EXITING

Adisadvantage of adding a vegetarian hot-food option to a school lunch menu is that it would a. force all students to change their diets. b. eliminate a meat option from the menu. c. only some students on special diets. d. increase the amount of food that is wasted.

Which statement best describes how chemical equations demonstrate conservation of mass?

In what three areas is the us leader?