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The physical structure of the organism reacting to the environment. The organism is not a singularity but a community of specialized cells. Changes occur in the environment, receptors on cells "dock" with bits of the environment (perception) that cause an actual physical change in the shape of the cell itself (thus movement is possible) and so on. Specialized cells within the organism accept certain bits of the environment (the organism constituting a part of that environment) change accordingly, produce the appropriate movements and baby-chick runs from the shadow.


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