http://www.nhptv.org/natureworks/nwepecosystems.htm
http://www.kidsgeo.com/geography-for-kids/0164-ecosystems.php
http://schools.bcsd.com/fremont/4th_sci_life_ecosystems.htm
http://fedediegosebasdavid.wikispaces.com/4.Ecosystems
http://www.globalchange.umich.edu/globalchange1/current/lectures/kling/ecosystem/ecosystem.html
https://www.thinglink.com/scene/373893887053266944
http://imgarcade.com/1/picture-of-ecosystem-for-kids/
http://ecosystems.noaa.gov/what_eco.htm
Video
http://www.neok12.com/Ecosystems.htm
Interactive
http://www.neok12.com/quiz/ECOSYS04
http://www.neok12.com/quiz/ECOSYS05