Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem.

Explanation

Ecosystem : The system where all the living organisms in an area together interact with the non-living constituents of the environment.

Detailed Answer:
An ecosystem can be defined as a functional unit of nature, where living organisms interact among themselves and with the surrounding physical environment .
Diagram to show the flow of energy in an ecosystem : Assuming 10,000 J of energy is available to the producers, then 1000 J will be available to the primary consumers, 100 J will be available to secondary consumers and 10 J will be available to tertiary consumers.