Answer:
Airborne chemicals are most likely to stimulate <u>olfactory receptors</u>.
Explanation:
Amylase is an enzyme, which are protein molecules that help in the breakdown of complex substances. Enzymes have optimum conditions in which they operate, which also include specific pH ranges. The pH in the stomach is too low for amylase to work in, so amylase is denatured and does not perform its function in the stomach.
The other organ producing amylase is the pancreas.
I believe it C- the activity and your fitness level
If your goal is to find a mentor who can help encourage you the category that it would fall under would probably be Academic