They are organized structures of dna
1. D.
2. C Saliva and enzymes from the pancreas help break down food.
3. C ---- I think it's hydrochloric acid, HCl. HCl is very low in pH (acidic) to digest foods
Answer:
a catalyst
Explanation:
An enzyme is an example of a catalyst which speeds up or controls the chemical reactions in an organism. A catalyst speeds up the rate of the reaction without itself being consumed by the reaction.
