Respuesta :

TatianaKaplan
The Earth is thought to have been formed about 4.6 billion years ago by collisions in the giant disc-shaped cloud of material that also formed the Sun. Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets called planetesimals.

Hope that helped ! :)
Supposedly the Big Bang happened and everything collided tiger and Earth was in the right place in the solar system with the right minerals and nutrients to grow bacteria then animals and so the Earth became how it is.