When life emerged on the earth, the earth was not the way it is now. We could not live on the original earth at the time that life first came about --- it was like a totally alien planet at the time. So the earth that exists now is perfect for the life that exists now, and the earth that existed then was perfect for the life that existed then. Both the earth and the life on it evolved together over time.

One example of this is the fact that the earth's atmosphere at the time of the emergence of life did not contain the oxygen it does now. When green plants evolved, they began to put oxygen into the atmosphere. Once there was enough oxygen, new kinds of oxygen-breathing organisms evolved. So in that case, the evolution of a new kind of life resulted in a change in the earth itself, and that change in the environemnt lead to the evolution of another new kind of life.