Answer:
you can throw me away but I will always be coming back
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. Amidst a light brown grassy lawn with an outline of a green grass.
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
I'm simple for a few people, but hard for them to hear. I live inside of secrets and bring people's worst fears. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.