The gases used in the respiratory activities of Sailors divers are ........

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The gases used in the respiratory activities of Sailors (divers)are:

oxygen+nitrogen

oxygen+helium

oxygen+argon

oxygen+neon

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Explanation:

oxygen and helium

The main reason for adding helium to the breathing mix is to reduce the proportions of nitrogen and oxygen below those of air, to allow the gas mix to be breathed safely on deep dives. A lower proportion of oxygen reduces the risk of oxygen toxicity on deep dives.