An ecosystem can be...

Under a rock, you         might find an escosystem of worms, stones, and bits of wood.

An escosystem can be under a rock. Wet soil, insects, and worms are in that ecosystem. An ecosystem can be large. A forest is a large ecosystem. Trees, animals, and rocks are in a forest ecosystem.

An ecosystem has a climate. The climate can be hot, warm, or cold.
The climate can be wet or dry. The desert has a dry climate. In a forest, the climate might be cool and damp. Changes in climate affect ecosystems.

What two parts make up an environment?