How did life originate on Earth? There are so many blank spots in the pages of history that even now with all our technology we still aren’t 100% sure where life came from.
In this video, John Green and Hank Green take us from the creation of the first oceans to prokaryotes, single celled organisms that evolved 3.5-4 billion years ago. These are the starting point for all life on earth, so we are all related to everything!
Using photosynthesis, prokaryotes managed to transform our atmospheric oxygen levels creating a huge population bottleneck (most organisms died) leaving behind tiny specks of oxygen tolerant life.
1.6-2 Billion years ago Eukaryotes emerged, containing organelles built by DNA. They started having sex 1.5 billion years ago revolutionising evolution. We know cells replicate using DNA, and when errors occur, so do mutations. This is the concept of evolution.
Beneficial errors in the copying of DNA have led us to the species present today and will continue to do so for as long as the earth lives.