Answer:
A) milk
Explanation:
Pure substances are materials that have constant chemical composition and physical and chemical properties as they do not change at constant pressure and temperature. Examples of pure substances are oxygen, water and carbon dioxide.
On the other hand, there are compound substances, which unlike simple substances are chemical compounds formed by atoms of different chemical elements, such as milk that is formed from elements from the blood of the animal and contains amino acids, fatty acids. , lactose and certain minerals.
