write the code for a two-item unordered list, with another two-item unordered list nested in its first item.

the fossil record provides evidence of a common ancestor to many species.

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.