Biology  5/e   Raven/Johnson
	Student   Online Learning Center

The amplification analogy in the book is very straight forward, but students will quickly identify with the shampoo commercial where "you tell two friends and they tell two friends ..." while they see on TV one person, then two, then four and so on. You could also do a class demo on this, distributing note cards, rubber bands or other small, inexpensive objects.

Make models of various cell-cell interactions using plastic, paper, string, straws, etc. Better yet, have your students make them, collect them, choose the best and you will have models to show in class next semester!

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