Is Earth the Only Planet with Life?
Earth is the only planet with life because, Earth has temperature change that is not far over 100 degrees or below 0. Which other planets have. Earth also has seeds and water to grow food which again other planets don't have. Because of all of these items we need to live with it is proven there is no life on any other planet besides Earth that.
Characterstics Earth has to allow life
There are foods, water and other items we need to live that other planets don't have. For example Earth has oxygen that we absalutly need to survive. There is also no soil to plant foods so we would starve to death. Do you get my point, Space Aliens?
What's Necessary for life to stay alive on Earth and provide those things?
Earth is very good at providing Oxygen to live or stay alive. it stays like that from trees,a brown branch with a sprout at the top of green leaves. So good job trees!!!