Which two molecules are compounds? nahco3 o3 cl2 c8h18

Answer : The correct options are, and

Explanation :

Molecules of element : It is defined as a pure substance that is composed of atoms of similar elements.

For example :  etc.

Molecule of compound : It is defined as a pure substance that is made from atoms of different elements combined together in a fixed ratio by mass.

For example :

Form the given options, and are the compounds. While the other options, and are the molecule of elements.

Hence, the correct options are, and

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.

voluntary muscles are controlled by the cerebellum.