Final answer:
Lynn Margulis's theory of evolution posits that biological diversity is a result of interdependency rather than competition among organisms. This theory challenges the traditional view held by most biologists.
Step-by-step explanation:
Lynn Margulis's theory of evolution differs dramatically from most biologists. Margulis proposed the theory of endosymbiosis, which suggests that evolution is a process involving interdependency rather than competition among organisms. This theory states that certain organelles, like mitochondria and chloroplasts, were once free-living bacteria that formed a symbiotic relationship with eukaryotic cells. Margulis's theory challenges the classical gradualist theory of evolution, which was widely accepted by biologists in the late 1960s.