An ecosystem is a natural unit of plants, animals, and microorganisms functioning together with all non-living environmental factors. To conserve this delicate balance, it is important to know what part each piece of the natural ecosystem does for all the others. Preserving any bio-network can be very difficult, because it is almost impossible to know what each element of the ecological unit adds to the equation. In many cases, the best way to conserve an ecosystem is to just leave it alone Ecosystems are everywhere. Any kind of environment or atmosphere is part of some ecosystem somewhere. There are many different kinds of ecosystems and some of the most well known are desert ecosystems, natural ecosystems, forest ecosystems, coral reef ecosystems and ocean ecosystems. There are also human ecosystems.