Scientist think fhat dolphins and whales may have evolved from a common ancestor what evidence support this hypothesis?

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

correct answer is a. and d.

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.