Chemically alter the make-up of nutrients, changing them into a form that can be readily used by cells. a) enzymes b) amino acids c) carbohydrates d) nutrients

a) Enzymes

Explanation:Enzymes are biological catalyst that acts on reactions that takes place in living organisms.enzymes are proteinous in nature and are specific in the substrate they act on .

In multicellular organisms,ingested food needs to be broken down into forms that can be absorbed by the body.the digestive system perform this function through mechanical breaking down of food eg in the mouth and through enzymes.

An example of enzyme is the amylase in the mouth which digest starch.

Unicellular organism do not have digestive tract but within their cytoplasm ,they digest food in a

food vacuole by the use of enzymes.