What Am I Riddles

Question: Without me you're blind but once you touched in the right place you can turn me on. What am I?

Question: I'm the one that gives you information, I'm the one that lets you have the ability to control yourself, I'm the one that stores all memories and without me you'll be dead in a instant. What am I?

Question: What has no beginning, end, or middle?

Question: Something longer than a camel but shorter ever than a Cup?

Question: We are just like people. We grow, we get old, we die off. We come in many different colors. Black, white, brown. We come in a army, there are thousands of us, yet we have no war. But we will still die off over the years. What am I?