5. Which is an example of inertia?
a. The baseball sailed through the air and then fell to the ground.
b. I The truck driver pressed on the brakes and the truck slowed down.
C. The baseball player hit the ball with so much force that it broke the bat.
d. When the truck driver slammed on the brakes, all the boxes in the back
of the truck slid forward.

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?