Answer:
What can you throw but not catch?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
What an fill a room but takes up no space?
Look into my face and I'm everybody. Scratch my back and I'm nobody.
What can be measured but not seen?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?