riddels 6I

I shave every day, but my beard stays the same. What am I?(one word answer)

i have branches but no fruits,trunk or leaves. what am I?(one word answer)

what can't talk but will reply when spoken to?(one word answer)

the more of this there is,the less you see. what am I?(one word answer)

David's parent have three sons:Snap,Crackle, what's the name of the third son?(one word answer)

I follow you all the time and copy your every move, but you cannot touch me or catch me. what am I?(one word answer)

what has many keys but can't open a single lock?(one word answer)

what gets bigger when more is taken away?(one word answer)

what invention lets you look right through a wall?(one word answer)

what goes up and down but doesn't move?(one word answer)