What molecules can produce more energy per gram than sugars and are used for storing energy in animals?

A. carbohydrates

B. proteins

C. lipids

D. hydrocarbons

The answer is lipids

The answer is C: Lipids. Because:

1 gram of carbohydrates provides 17 kJ of energy per gram.

1 gram of protein provides 17 kJ of energy per gram.

1 gram of fat provides 37 kJ of energy per gram.

Hydrocarbon is a fuel so it is not stored in animals.