Scientists tell us that the planet that we live on was once a lifeless rock, spinning around the sun. It would have been black, and brown, and gray, with a poisonous atmosphere. It would have been incredibly hot on one side, with the water vaporized, and incredibly cold on the other side, with the water frozen solid. And, again, lifeless. [think about the pictures that we see of the surface of Mars, or the moon].
Somehow life began. I won't debate on how that occurred, but the fact that we are here makes it inarguable that it did begin. And that was the beginning of many complex and interrelated cycles that transformed the earth from a lifeless rock.