4. What is the major function of the respiratory system?
A. Take oxygen in and get rid of carbon dioxide.
B. Take carbon dioxide in and get rid of oxygen.
C. Make energy using carbon dioxide
D. Make energy using oxygen

Which statement from the excerpt shows that president obama believes it is the president's duty to ensure that native american nations are involved in the democratic process? a. "when anybody in this country is not being treated equally under the law . . it's my job as president to solve it." b. "i made it a point to meet with tribal leaders . . because i wanted to make sure our country did better by our first americans." c. "i wanted to change the relationship between our governments—to elevate your voices in washington and give your tribes greater say over the decisions that affect the lives of your people every day." d. "and i wanted to turn the page on a history that is riddled with too many broken promises, [and] write a new chapter with a spirit of respect and trust."