As you enter the kitchen after school you can smell chocolate chip cookies baking. this scent causes you to salivate. your salivation is best explained by:

reflex (involuntary) action

Explanation:

Salivation, after smelling baked cookies is best described as a reflex action, i.e it is a rapid, automatic and unconscious response that would always occur regardless of time or environment.

Other examples of reflex actions are

- blinking of the eye

- withdrawal of hand from hot objects etc

satellites are frequently used to make observations of the orbit on earth

carbon atoms, hydrogen, oxygen, and nitrogen.