How do the atoms of a molecule stay together? a. chemical bonds b. magnetic force c. attraction of electrons and neutrons d. through physical changes

A is the correct answer. Molecules are groups of atoms that stay together because of chemical bonds. These can be covalent bonds, where electrons are shared between atoms, or ionic bonds, where the difference in (positive or negative) charge between ions causes them to attract.

Most smaller stars don't have a radiative zone.