This interactive "I have, who has" game reviews students over the concepts of ecology, biomes, food webs, food chains, energy pyramids, biotic factors, abiotic factors, trophic levels, consumers, primary succession and secondary succession (to name a few). Appropriate for 4th, 5th, 6th, and 7th graders. Could be used as a review or remedial activity for 8th and possibly 9th graders. 40-card game, accompanying worksheet to ensure engagement, full description of how to use game with multiple vari