Milestones in Biology 5: Test Your Knowledge

What did the discovery of a fossil sloth in a sea cliff on the coast of Argentina suggest to Darwin?

Why was Thomas Malthus’s book critical to Darwin’s thinking about descent with modification?

How did Wallace use Thomas Malthus’s book to inform his ideas about species?

What did the field experiences Darwin and Wallace had in observing the natural world at first hand add to their understanding of evolution that perhaps reading and thinking alone couldn’t provide?