ENERGY PYRAMID ACTIVITY - more practice
http://www.harcourtschool.com/activity/science_up_close/314/deploy/interface.swf
FOOD CHAIN - more practice
https://ecokids.ca/swf-files/gamesPage/chain_reaction.swf
FOOD WEB - more practice
http://teacher.scholastic.com/activities/explorer/ecosystems/be_an_explorer/map/line_experiment14.swf
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