Material for rain-proof coats and tents owe their water proof properties to ___?

✅ C. Stomach

✅ B. Ionizing Radiations

✅ B. Kidney

✅ A. Vitamins

✅ B. Lactometer

✅ C. Allergy

✅ C. depends on the gas used in the discharge tube

✅ B. Graham's Law