Earth formed 4.54 billion years ago, and life appeared on its surface within one billion years. The planet is home to millions of species, including humans. Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful solar radiation, permitting life on land. The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist during this period. The Earth, in recent years, has survived countless threats and is expected to, with the aid of the Coalition Planet Maintainment technology, is expected to continue to support life forevermore.
Even a brief overview of Earth would take volumes just to cover the world's pre-human races.