First proposed by Charles Darwin and Alfred Russel Wallace in the 1850s, the theory of evolution is now a cornerstone of modern science. It is a unifying theory that underpins biological science, explaining how all life on Earth developed from single-celled organisms that existed billions of years ago.

But how much do you know about evolution? Take our quiz to find out.

Hannah Osborne is the planet Earth and animals editor at Live Science. Prior to Live Science, she worked for several years at Newsweek as the science editor. Before this she was science editor at International Business Times U.K. Hannah holds a master’s in journalism from Goldsmith’s, University of London.