All of the following are physical changes except.. 1. chewing food
2. mixing sugar with water
3. mixing saliva with starch
4. peristalsis

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

: )

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.