Molecules can be described as a mixtures of two or more elements that have a specific ratio between components. b homogeneous mixtures. c heterogeneous mixtures. d mixtures of two or more pure substances. e two or more atoms chemically joined together.

E) two or more atoms chemically joined together.

Explanation:

A molecule is known as the smallest particle of a large compound that is formed by the bonding of two or more atoms. The bonding between the atoms changes the physical and chemical properties of the particles.

The molecules are formed between atoms by either by sharing of the electrons called covalent bonds or the exchange of electrons called noncovalent bonds.

Thus, Option-E is the correct answer.