B. The surface of a silver cup turns black when it is exposed to air.
I personally think that it’s C.
(i’m sorry if it’s wrong)
First of all, it is a nucleic acid, not nuclear acid.
Examples are DNA and RNA( Deoxyribonucleic Acid and Ribonucleic Acid)
As the warm water holds more salt then cold water the fingers cool and produce crystals of salt that soon rains down to the floor of the ocean
