Which level of organization does the phrase below belong to? The air was cloudy as the birds and geese migrated south. They stopped on a tree to take a break and the sun began peeking out behind the clouds.

Scientists have determined that the V-shaped formation that geese use when migrating serves two important purposes

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.