What color is the bear

We capture light, and yet we don't. We reflect rays of sun, and yet we don't. Without us all the world is gray and dull for everyone. What are we?

There's a land where there's mummies and daddies but no babies. Books but no libraries. Mirrors but no reflections. Kittens but no cats. Cattle but no cows. Lollipops but no candy and trees but no forests. It's the land of what?

A man goes into a cabin deep in the country. All walls within this cabin face south and are made of wood. A bear walks by the window. What color is he?

I am mother and father, but never birth or nurse. I'm rarely still, but I never wander. What am I?

Give me food, and I will live; give me water, and I will die. What am I?