After a discussion of the characteristics of arthropodes (insects, etc.) you can trace the evolution of these animal and what adaptations they have to survive in virtually every part of the earth. There are lots of photos of these interesting animals.
This resource is part of the Biology Links for One Laptop Per Child course which contains units on Exploring Life; The Cell; Genetics; Mechanisms of Evolution; The Evolutionary History of Biological Diversity; Plant Form and Function; Animal Form and Function; Ecology; and Astrobiology.
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