What is an ecosystem ...

This is actually more of a biology post but, whatever.

An ecosystem is like a complex community filled with living organisms (animals, plant's etc) that all interact with each other in some way (like a food chain, ants eat grass, something eats ants, something eats something ...).

Ecosystems can be in the water, can be in the air, or in the land, etc etc.

An ecosystem is a biological community of interacting organisms and their physical environment.