Around 14 billion years ago everything that you see and know today existed in a tiny little dot, the size of a dust particle maybe smaller. That dot was called the singularity and is the reason why we are all here today. However, the singularity particle became very unstable and exploded, sending the elements of our universe everywhere, calling it the big bang.
Resources from the Stars
The Dust particle reacted with the gravitational field in space which made it collapse and create a nuclear reaction due to the heated and created stars, one with much bigger dust particles which we refer to as the sun.
Finalizing of the other planets
As well as the extra dust particles, the sun formed purple matter with gravity that evolved into smaller reactions which scientist classify as planets, the most notable being Earth, the world of humanity.
The beginning of earth
Over a period of time, the Earth collided into many comets. one of which gave ice which froze and that also condensates into clouds and the atmosphere, that created water and most notably its inhabitants, early sea anemone.
for the time being, the same process happened to other planets that ere created in the universe. It all depended on how far away from the sun they each were as the further out, the less gravitational pull and heat there was on the world. All collected, each planet revolved around the sun from further distances depending on this pull.
Back to the subject of Earth it was only land and water that was until sea anemone evolved and became all the different species we know and see today, however some we do not see because they are classified as extinct.
There is evidence that the big bang happened because if you notice that when an ambulance or police car goes past, its siren is high pitched as it comes towards you, then becomes low-pitched as it goes away. This effect, where there is a change in frequency and wavelength, is called the Doppler effect. It only happens with any wave source that moves relative to an observer.