The tree of life is really the story of evolution. How life for animals (and we are animals!) has changed over centuries.
But, what I and many others believe, is the Circle of Life. We are born, we procreate to prolong our species, and then we die.Our bodies then go on to feed other forms of Life; so we live again, not as humans, but as another form of Life. It is a circle, and it is never ending.