D Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients. Components of this system in vertebrates include the kidneys, liver, lungs, and skin.
To correct chemical formula for ammonium carbonate is the first option
Cells have a semipermeable membrane that controls what enters and leaves the cell.
It makes the bronze stronger and harder than either of the other two medals
