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Punch and Judy
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punctuated equilibrium
punc·tu·a·ted e·qui·lib·ri·um


noun 
Definition:
 
theory of evolution: a theory of evolution holding that evolutionary change tends to be characterized by long periods of stability, or equilibrium, punctuated by episodes of very fast development
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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