In cellular respiration, energy is converted from

glucose to sugar
nadh to sugar
glucose to atp
atp to nadh

1. glaciers are melting

2. more water going into ocean (water's such as fresh waters, etc)

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.