On a warm summer day mrs. camp placed some flowers in a zippered sandwich bag and sealed it with enough air to provide protective air space for the flowers. she then placed the sealed bag in the refrigerator to keep the flowers cool. describe what happened to the bag as it cools in the refrigerator. why does this happen?

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?