I believe propane burns to form water vapor and carbon dioxide
Answer:
C since however many times you repeat an experiment, it should give the exact same results or it wouldn't be accurate enough. ex if you measure a liquid to be 77ml in USA, it should give the same when measured in Germany, same with repeating experiments.
It's inertia. Inertia is the force that resists change in motion, like the planets and gravity. Inertia is effected by gravity
