Aresearcher is interested in finding out if the amount of amylase varies from person to person what would be the best way to test this

I think it would be throught Saliva testing

Explanation:

In a person saliva the amylase can be detected.

Take consistent amounts of saliva samples from a number of people who have not eaten in 8 hours and measure the quantity of amylase in each sample.

Explanation:

well

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.