State the difference between respiration, gas exchange and breathing

option c is the correct answer.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

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.