Ecology. 

 - Teacher's Edition. 
 - Illinois :  McDougal Littell,  2005. 
 - xxxii, 240 p :  ill., col ;  29 cm. 
 - McDougal Littell Science .
 - McDougal Littell Science .
<br/><br/> Includes Index. 
<br/><br/>Ecosystems and Biomes -- Interactions within Ecosystems -- Human Impact on Ecosystems. 
<br/><br/><label>ISBN: </label>0618334300 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Science--Study and teaching (Elementary)