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Unit 1:
Ch. 1
Ch. 2
Ch. 3
Interlude A
Unit 2:
Ch. 4
Ch. 5
Ch. 6
Ch. 7
Ch. 8
Ch. 9
Interlude B
Unit 3:
Ch. 10
Ch. 11
Ch. 12
Ch. 13
Ch. 14
Ch. 15
Interlude C
Unit 4:
Ch. 16
Ch. 17
Ch. 18
Ch. 19
Interlude D
Unit 5:
Ch. 20
Ch. 21
Ch. 22
Ch. 23
Ch. 24
Ch. 25
Interlude E
The animations require the latest Flash 7 and Shockwave plug-ins.
22.1: Activity: Mutualism in action

ThumbnailThis animation provides examples of associations between two species in which both species benefit.

22.2: Activity: Competition in action

ThumbnailLearn how competition can limit the distribution and abundance of species.

22.3: Tutorial: Character displacement
Thumbnail

This tutorial explains how intense competition between similar species may cause forms of the competing species evolve to become more different over time.

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