Question

Substances that are basis of human life on earth is:
(A) Atom
(B) Molecules
(C) Organic compounds
(D) None of the above

Answer 1

There are a total of $118$ elements in the periodic table. out of which the compounds that formed carbon were known as organic compounds. The compounds that were formed from other than carbon was known as inorganic compounds. Organic compounds play an important role in the life of organisms.

Complete Step By Step Answer:
Atoms are tiny particles consisting of subatomic particles like electrons, protons, and neutrons. Atoms combined to form molecules. Water is a molecule with a chemical formula of ${H_2}O$ and has two hydrogen atoms and one oxygen atom.
Organic compounds are the compounds that were formed from the element of carbon. Carbon is an element with atomic number $6$ . Because of the four valence electrons in carbon, it exhibits tetravalency and is responsible for the formation of a large number of chemical compounds. These chemical compounds were known as organic compounds.
Every organism on earth requires carbon. The basic chemical reaction is photosynthesis which is the preparation of glucose from carbon dioxide and water.
The substances which are the basis of human life on earth are organic compounds.
Option C is the correct one.

Note:
Carbon is considered the king of the elements in the periodic table due to its ability to the formation of a huge number of chemical compounds. Carbon can be able to exhibit catenation property which is important in organic chemistry due to its tetravalency.