Amolecule of an organic compound contains at least one atom of
(1) carbon (3) nitrogen
(2) chlorine (4) oxygen

(1) carbon

Explanation: Organic compounds are those compounds which contains a carbon atom. Nearly all organic compounds contain hydrogen and some of the organic compounds contain oxygen. Example: Glucose(), Methane ()

Inorganic compounds are those compounds which do not contain a carbon atom. Example :

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.