It is widely believed that once all the particles came together and became the size of a pea ...this is the big crunch....afterward it exploded and sent particles flying in all ways . this is known as the big bang which created the universe. After the creation of earth...there were thunderstorms,volcanoes. The ligntning reacted with nitrogen in air to form amino acid sugars which created living cells.this cells evolved over time to form humans and animals
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