Respuesta :

Caribou
They are forms of sugar and proteins, they are all carbohydrates and they are all related to photosynthesis.

Explanation:

Hello! Let's solve this!

All three compounds are carbohydrates.

Starch and cellulose are made up of linked glucose units.

Glucose is made up of Carbon, Hydrogen and Oxygen.

So all three are carbohydrates made up of the same elements. Carbon, Hydrogen and Oxygen.