19th-century naturalist buried in Westminster Abbey

DARWIN

This British scientist revolutionized biology with his theory of evolution by natural selection, famously documented after his voyage on the HMS Beagle.

This clue points to Charles Darwin, the famous 19th-century naturalist who developed the theory of evolution. He was honored with a burial in Westminster Abbey, a prestigious site for notable figures in British history. The answer is simply his last name, "DARWIN," with no wordplay—just a direct reference to his legacy.