Many processes occur in the digestive system .which process is best classified as a physical change

This question lacks options, the options are:

A) Saliva converting the starch molecules in crackers into simple sugars

B) Digestive enzymes breaking down proteins into smaller fragments

C) bacteria converting lactose into simple sugars in the intestines

D) teeth grinding an almond into smaller pieces in the mouth

The answer is D

Explanation:

A physical change is a change that occurs to a substance without altering its chemical composition. A physical change involved a change in the substance's shape, texture, color, state etc. but not the chemical content of such substances.

In this question involving the processes that occur in digestion, a typical example of physical change is "teeth grinding an almond into smaller pieces in the mouth" because the teeth only changes the shape and texture of the almond. It does not affect the chemical composition of the almond fruit. This is also called mechanical digestion.

Note that, other options involving digestive enzymes breakdown are chemical changes because the enzymes breakdown the chemical components of each substance.

D

Explanation: because you are breaking down food in a physical change

the answer to your question is slate

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.