For four - fifths of our history, our planet was populated by pondscum. — J. William Schopf Copy Share Image
For four - fifths of our history, our planet was populated by pondscum. — J. William Schopf Copy Share Image
Given that evolution is a fact, this lack of evolution needs to be explained. — J. William Schopf Copy Share Image
“For four fifths of our history our planet was populated by pond scum.” — J. William Schopf Copy Share Image
