Answer:
If two's company and three's a crowd what are four and five?
I am black and white. I have strings I have keys. I make sound without my lips. I make dough with no flour
I am needed for most animals and hardcover books
I produce wool and spit a lot
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
The answer I give is yes, but what I mean is no. What was the question?