Which part of your integumentary system is found on the outside of your body? * a. Epidermis
b. Keratin
c. Dermis
d. Melanin

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.