Carbohydrates are major sources of energy for the body and are found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).

The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.

A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.

Food is mixed with gastric acid and pepsin in the stomach to help break down protein.