The structure that results when atoms are joined together by covalent bonds is called a(n)

Molecule is formed when atoms are joined together by covalent bonds.

Molecule is a combination of similar type of atoms, whereas, compound results by the combination of 2 or more different atoms or different molecules.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the answer is c.) there is a warm front in region a and a stationary front in region b.