I think that the bright light would be the "stimulus" and the pupil constricting would be the "response".
Cell, DNA, chromosome, gene
In order of decreased size
Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.
Explanation:
A large force is applied to an object with a small mass