What differentiates passive transport from active transport? A. Proteins have a role in passive transport.

B. Molecules move down a concentration gradient during passive transport.

C. Passive transport involves molecules moving across the cell membrane.

D. ATP is needed for passive transport to occur.

"d.) carbon dioxide and hydrogen sulfide"

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.