What is an ecosyststem?
An ecosystem is made up of all the living and non-living things in a habitat. This includes all of the plants, animals and microorganisms together with the non-living materials such as water, rocks, soil and sand.
For example, a pond ecosystem may consist of a pond habitat, inhabited by aquatic plants, microorganisms in the mud at the bottom, fish in the water and a heron on the bank.
If one part of an ecosystem is changed, this may affect other living things in the ecosystem. For example, if a disease suddenly wipes out the plants in a pond, it might affect the fish and heron because they have less food to eat.
Why are trees important?