WHAT IS CIRCULATORY SYSTEM?
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circulatory systemnounthe system that circulates blood and lymph through the body, consisting of the heart, blood vessels, blood, lymph, and the lymphatic vessels and glands.
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➡️digestive food ine artillery canal and absorbing O2 from external environment in respiratory organs lb of no use to an animal unless the digestive nutrients and O2 are transported from these organs to all the body cells where bees are actually needed and utilised that is why all the higher multi cooler animal where there is completed division of labour purses and extensive pipeline system called circulatory system
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