Additionally, within the first billion years, Earth's history, life appeared in the oceans and began to affect the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Since then, the combination of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive. Over 7.6 billion humans live on Earth and depend on its biosphereand natural resources for their survival.
Regarding the villain tournaments, Earth is featured as the primary location of the series in which most of the plot takes action on the planet, recounting about events, political changes, and creation of civil wars against minorites or majorites of any kind. It also appears as one of the royal battle sceneries, during a Space Arc of any villain tournament where it is threatened by various alien forces.