I love this short animation by Faith Hubley from 1981 and I’m sure I was shown this at school some time in the mid 80′s.

The story starts at the formation of the solar system, showing how Earth was the only planet placed just right in distance from the sun. It continues showing how amino acid chains formed proteins, proteins to cells, cells to asexual reproduction, and asexual reproduction to sexual reproduction.

Video made responsive using the wonderful fitvids.js from Paravel.