Where does the body get each of these molecules?
• glucose molecules
• amino acid molecules
• oxygen molecules

Glucose - from the food we eat, then the food is broken down into another type of sugar called glucose.

Amino Acid - animal proteins such as meat, eggs and poultry. When you eat protein, it is broken down into amino acids.

Oxygen - we get oxygen by breathing in fresh air.

a. is the answer because they are not shared