Most likely an asteroid nit the earth containing cells, bacteria, whatever you fancy.
These cells found Earth a hospitable planet and began to multiply in the sea, over billions of years these cells multiplied and split and grew to become tiny animals of the most basic evolutionary structure.
These small animals needed a new way to reproduce and thus over more hundreds of millions of years developed a mating process and genders.
After more billions of years these animals craswled out of the sea and adapted to the land to survive (Replaced fins with limbs etc).
Over even more hundreds of millions of years these animals evolved into countless species and different physical structure depending on the environment and rival animals.
Then the earth was hit by a meteor and wiped 90% of the earths life from its surface.
The process of re-population began. Slowly apes and monkeys were formed. They evolved to grow larger and more intricate brains. They then started to stand on two feet and use their arms for other purposes, ie, a better a to hold objects. We lost our hair and got taller. And have just continued to get taller and less hairy, and of course, smarter.
Thats how i think we came to be. I think if you believe in adam and eve or god made you with clay your need education
