Enzymes are part of the digestion process. their function is to break down . amylase is a digestive enzyme secreted and is responsible for breaking down

Sugar and complex carbohydrates

Explanation:

The first digestive enzyme is encountered in the saliva of human beings. This enzyme is known as amylase. As a part of “process of chemical digestion of food”, digestion of simple sugars carried by salivary amylase in mouth is the first step.

Amylase breaks down complex sugars i.e carbohydrates into simple sugars by disrupting the chemical bonds between the saccharides molecules and thus converts it into simple forms.  

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

i believe the answer is a or 1