How is the word ecology different from the word ecosystem?

Ecology’s subpart is the ecosystem. The main difference between ecology and ecosystem is that ecology is the study of ecosystems. In ecosystems, the units of ecology are formed through the interaction of a community of organisms within the environment

 For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Wild Life (Protection) Act, 1972
• UPSC Environment and Ecology