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For respiration in deep sea, divers use mixture of:

For respiration in deep sea, divers use mixture of:

By Admin / October 4, 2025

A. Oxygen and helium

B. Oxygen and hydrogen

C. Oxygen and carbon dioxide

D. Oxygen, Helium & nitrogen

✅ The correct answer is option D.

The minimum temperature at which a combustible substance catches fire is called:

The first metal to be used by man was:

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