The term ‘ecology’ was introduced by

The correct answer is Ernst Haeckel.

Explanation:

Ecosystem: 

All organisms such as plants, animals, microorganisms and human beings, and their physical surroundings interact with each other and maintain a balance in nature. All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem.

Ecology is the science treating the reciprocal relations of organisms and the external world. 

• The functional unit of the ecological system involves complex actions occurring between its biotic and biotic components.
• The term ecology system was first used by Ernst Haeckel​.
• Dr. Ramdev Mishra is known as the father of ecology in India. He founded the International Society for Tropical Ecology in the year 1956.