ECOSYSTEMS

Grasslands, deserts, tundra, rain forest, ocean, coral reef... are ecosystems.

What things form an ecosystem?
How do the living things stay alive  in  an ecosystem?

Hibernating Animals Memory Match:
Food chains
Animals and plants feed off each other:
http://www.sheppardsoftware.com/content/animals/kidscorner/games/foodchaingame.htm