WATCH THIS VIDEO AND COMPLETE Changes in the Arctic Ecosystem Chart:
Source: Copyright 2008 KQED San Francisco
Read article, watch video, answer questions on worksheet:
http://opb.pbslearningmedia.org/resource/thnkgard.sci.ess.chain/think-garden-whats-a-food-chain/
Source: Copyright KET 2012
Source: World Wildlife Fund/World Images This media asset comes from the World Wildlife Fund .
Source: Bigelow Laboratory for Ocean Sciences