Ancestor Quote by David M. Raup

For the first half of geological time our ancestors were bacteria. Most creatures still are bacteria, and each one of our trillions of cells…

— Richard Dawkins

... probably all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was…

— Charles Darwin

“Life on earth evolved gradually beginning with one primitive life form – perhaps a self-replicating molecule – that lived more than 3.5 billion years…

— Jerry A. Coyne

“Biochemists assume that the three cellular kingdoms evolved from a single common ancestor, because the alternative of supposing an independent origin of life two…

— Phillip E. Johnson

“Throughout 150 years of the science of bacteriology, there is no evidence that one species of bacteria has changed into another... Since there is…

— Alan H. Linton

The question of the origin of life is essentially speculative. We have to construct, by straightforward thinking on the basis of very few factual…

— John Desmond Bernal

Most life on Earth is microbes. we've only just scratched the surface of the microbial realm. Probably less than .1% of microbes have been…

— Paul Davies

Sometime in the first billion years, life appeared on the earth's surface. Slowly, the fossil record indicates, living organisms climbed the ladder from simple…

— Robert Jastrow

Life began three and a half billion years ago, necessarily about as simple as it could be, because life arose spontaneously from the organic…

— Stephen Jay Gould

Each of these [bacterial] species are masterpieces of evolution. Each has persisted for thousands to millions of years. Each is exquisitely adapted to the…

— E. O. Wilson

All the world began with a yes. One molecule said yes to another molecule and life was born. But before prehistory there was the…

— Clarice Lispector

We only recently figured out the origin of our own moon. And we have some idea of how the Sun and Earth formed, but…

— Neil deGrasse Tyson