We live in a stunning planet. We must be the envy of all the other planets that surrounds us, in our Solar System. Our positioning is such that it creates the perfect atmosphere and conditions for life to thrive, compared to other hostile conditions that other planets surely face. Our planet has existed billions of years and life too has perhaps existed all this while. It is evident from the numerous archaeological proofs that we get - in the form of fossils etc ( that's how we discovered the Dinosaurs, didn't we :-). There have been many a species that got extinct and new ones created, over and over – that’s the marvel of nature. The Almighty has created this beautiful planet keeping perfect balance in mind. Thus, even though there has been evolution and changes throughout, a balance was maintained at all times.