eNature's Field Guides will provide you with detailed information about various populations.  If you chose to do the "ZipGuide", you can see all kinds of organisms that live here in GA!  (Make sure that you see the categories under the map!)
A Walk in the Woods - okay, to be honest, the guy's voice is spooky, but this video/audio tour is pretty interesting! Make sure you have your sound on!
American Field Guide takes you to several interesting ecosystems.  This site even has video clips - scroll to the bottom to view them!
Symbiotic Relationships - a handy chart of the types; short and to the point.
Mutualism - examples and descriptions with some very nice photos!
Commensalism - same site as above, but this page is about commensalism
Symbiosis in the Forest - interesting read and short!


Fitting Algae into the Food Web - a great overview of the concepts in 23.1 - Play the food web matching game below the text. 
Food Webs from Gould League - there are four on the front page, then you can try the "Mystery!"
Geography4Kids.com on Food Chains
The Cycles of Matter - a more advanced look.  Scroll to the bottom and see the three Gas Cycles - after you click there, make sure to scroll down below the diagram for the text
The Water Cycle Click on the pages to the left: Introduction, Scientific Concepts, and The Cycle
Tour of Biomes
Habitats as Biomes
Biomes for the advanced student - scroll down to the table for information on specific biomes
Biomes by the Evergreen project
The World's Biomes
Enchanted Learning's Biomes
Earth Observatory - scroll to the bottom to do the two activities in the circles
Play this game - Chain Reaction


Yahoo Kids jump site for many endangered animals
Endangeredspecie.com - lots of information here - good photos!
Investigate Biodiversity - check out this "basics" site - follow the links on the lower left "Threats," "hotspots," and "challenge"
"Ology.com's" biodiversity page - very interesting and written for MS kids.
WWF - World Wildlife Fund page
Science Olympiad  Ecology
Science Olympiad
Microbes
Here are some links you will want to explore and read through...

Microbeworld.org - - Go in and "meet the microbes"
Infection Detection Protection - go to all seven different links
microbe zoo - visit all the areas and see what you can find out.
PBS.org's
Intimate Strangers - start with the Tree of Life and keep clicking on the next page to read through all of this information.  There is lots of new info in this field and this is very up-to-date.
Microbes Info - this is heavy-duty stuff.  Read through this to find out everything you could ever want to know!
Medical Mysteries - work your way through all four missions and learn lots of stuff about infectious microbes!

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