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What are the basic functional systems of animals?

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Animals' basic functional systems include a musculoskeletal system, for supporting and moving the body; a nervous system, for receiving and processing sensory information and for carrying signals to control muscle and hormone activity; an endocrine system, for secreting hormones to chemically control bodily functions; a digestive system, for receiving and processing food; a circulatory system, for carrying nutrients and oxygen to cells and carrying away their wastes; and a reproductive system, for producing offspring to ensure species survival.

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