Answer:
I am mother and father, but never give birth or nurse. I'm rarely still, but I never wander. What am I?
What is at the end of a rainbow?
What is black when it's clean and white when it's dirty?
I am easy to waste. I am unstoppable. What am I?
The more holes you cover the lower I go.
The answer I give is yes, but what I mean is no. What was the question?