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How does a cat do the same thing? Isn't it a function of the brain to differentiate between different objects in the environment? Whether it be at a basic level as has been show in some bacteria which will swim 'up' a chemical gradient in order to be nearer a digestable substance, or at a more sophisticated one like being able to tell the differences of form and association between the figures 1 and L - they must surely all be related to some task with evolutionary significance.
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