Originally Posted by
OrphanPip
Margulis was a respected name, but her ideas are highly marginal. What kept her a margin of respectability is a moderate commitment to real science and testable hypotheses. Although, she got increasingly crazy as time went on, becoming an HIV/AIDS denialist and 9/11 truther.
Margulis suffered from an unfortunate blindness about natural selection, that I think derives from her commitment to the Gaia hypothesis, she imagined life as a cooperate web like super organism, so she had trouble accepting evolution as a mutation and competition driven process. Her ideas about symbiotic evolution are almost entirely rejected, except for a few instances like the origins of the mitochondria and chloroplast.
The evidence supporting mutation and natural selection as the primary, of many, mechanisms of evolutionary change is very strong.