Glad you asked...
To draw an ecosystem you have to know the you will need the color green. An ecosystem can be many colors but mostly plants and animals that live there.
Then again, this answer might help you...
Drawing an ecosystem will help describe what animals need to survive, how plants and animals are interdependent, and what animals look like in their natural habitat. For more information look here: http://www.nationalgeographic.com/xpedit...;

