Which sentence is correct? who's going to walk the dog today? whose going to walk the dog today?

The correct answer is the first one, "Who's going to walk the dog today?"

The first one. The word "whose" is possessive, whereas "who's" is a conjunction for "who is." So, the first sentence would be correct if you are trying to ask who is going to walk the dog today. 

The answer is ozone layer.

Can you write it in english