When you catch a baseball, what kind of work do you do, negative or positive? By
catching the baseball, what do you change? Does the basebal gain or lose energy
What kind of energy?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Explain that newton first law, second law and third law of motion?

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?