1. which of the following is not part of john dalton's atomic theory?
a. all elements are composed of atoms.
b. all atoms of the same element have the same mass.
c. atoms contain subatomic particles.
d. a compound contains atoms of more more than one element.
2. who provided evidence for the existence of a nucleus in an atom?
a. john dalton
b. j. j thomson
c. democritus
d. ernest rutherford

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?