Researchers are investigating processed that happen during digestion which answer choice describes only a physical change during digestion

Chewing in the mouth breaks food into smaller pieces

Explanation: all you are doing is breaking down the food in your mouth

Chewing in the mouth breaks food into smaller pieces

Explanation:

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.