Why does your body need to breathe in oxygen? a. Your blood uses the oxygen to help it clot and fight disease.
b. Your lungs store oxygen in the alveoli to help absorb carbon dioxide.
c. Your cells use the oxygen to break down sugar and produce energy.
d. Your heart uses the oxygen to make blood.

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.