Georges-Louis Leclerc, Comte de Buffon suggested that species could degenerate into different organisms, and Erasmus Darwin proposed that all warm-blooded animals could have descended from a single microorganism (or "filament").
Georges-Louis Leclerc, Comte de Buffon, foreslog, at arter kunne adskille sig til forskellige organismer, og Erasmus Darwin foreslog, at alle varmblodede dyrearter kunne have nedstammet fra en enkelt mikroorganisme (eller "filament").