Which best differentiates between chemical digestion and mechanical digestion ?

Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates.

I hope that help c:

it marks things for degradation via the proteasome. it alters there celluar location.