The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ___ ?

✅ A. 4°C

✅ A. Convex

✅ C. Retinol

✅ A. Electromagnetic radio wave frequencies

✅ B. silk production

✅ C. Earth is revolving round the sun

✅ B. Capillary action

✅ D. Black