Biology: Living Systems

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Chapter 28: Ecosystems 
Ecological Pyramids
This site defines different types of ecological pyramids and explains how energy is lost at each level. What are the three different types of ecological pyramids? How are these pyramids different?

Lichens
Lichens are a combination of two organisms; a fungus and an alga or cyanobacterium. Explore this site to learn more about lichens. What is the most serious threat to lichens?

 
 
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Biology: Living Systems