What Am I Riddles

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.

Question: What has a lot to say but can't be heard because it can't speak one single word?

Question: What goes back and forth constantly, but never in a straight line?