The correct definition of ecosystem is

All the organisms in a particular place interact with one another and with their physical environment. Ecosystems are made from two components, biotic and abiotic, with both components working together.

An ecosystem comprises all the organisms in a particular place that are interacting with one another and with their physical environment, and are interconnected by an ongoing flow of energy and a cycling of material. For example, in a pond, if there is no fish or living organism, the pond is stained.