What Am I Riddles

Question: There is a couple that is always together. They go anywhere they want to go. They can't be separated. No one can touch them. They are the size of a ping pong ball. What is it?

Question: What laughs while stalking prey, but never goes in for the kill?

Question: I am both black and white. I go with the flow and my loyalty never wavers.

Question: I have four feet in total, two that I stand on and two that I don't . What am I?

Question: I had a chance to be alive, but I am dead. I am white but some times brown. And most times when I open I feel like I'm burning as I face the sun.