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Respiratory System

Across
Organs that fish use to breathe
Two tubes that lead to the lungs
Waste gas released by the lungs
Muscle that makes the lungs expand and contract
Spongy organs that expand to fill with air
Openings in the leaves of plants that release oxygen
Down
Tiny balloon-like organs that allow oxygen to enter the blood
Tube in your throat through which air passes from the nose
Small tubes in the lungs
Gas that the body needs to live
Sticky substance that traps dust and germs