The virginia opossum has gradually spread from the east coast of the united states to the west coast as well as the northward into canada. researchers suggested this move north is in response to the milled are winters and man-made water reservoirs. this is an example of a a) result. b) theory c) procedure d) hypothesis

This is a theory! It cannot be a hypothesis because nothing is being tested, and there are no results or procedures

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explanation:

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organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.