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Across
1.The size of surface area needed for efficient gas exchange
7.Carbon dioxide concentration is maximum during this process
8.Tube that connects nasal cavity and bronchus
9.Process of exchanging gases from a higher to a lower concentration
10.This needs to be thin at a gas exchange surface
Down
2.Waste product of respiration
3.Element necessary for respiration
4.The percentage of inhaled oxygen
5.Lowering of diaphragm causes
6.An essential property of a gas exchange surface

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