Check the precondition and raise a KeyError if necessary Precondition: item is in self. Raises: KeyError if item in not in self. Postcondition: item is removed from self.

The development of simple stone tools by early hominids led to the ability to procure meat more efficiently. this in turn led to the change in diet that included larger amounts of protein. many scholars believe that this shift in diet was a significant part of how our ancient ancestors adapted so quickly to a varied set of environments, and thus were able to begin cultural development. this demonstrates the intimate connection between

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