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hn le
Explanation:
Navy, a nation's warships and craft of every kind maintained for fighting on, under, or over the sea.
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Answer:
These circulatory systems are called 'double' circulatory systems because they are made up of two circuits, referred to as the pulmonary and systemic circulatory systems. Humans, birds, and mammals have a four-chambered heart. Fish have a two-chambered heart, one atrium and one ventricle.
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