Bc you're their owner and you bring them joy so they missed you. :3
Proteins have structural roles throughout the body. Carbohydrates are the major energy source for cells in the body. I am unsure if lipids or nucleic acids apply.
The answer would be C because iron is magnetic
B is not correct because new molecules are formed so numbers can change. D isn't correct because the color often changes, for example metallic iron and clear oxygen form red rust. The arrangement of the atoms changes, too so a isn't correct. C is cotrect
Answer:
The answer is liter as it is the standard unit for volume
