Margulis argues that cooperation, not competition, is the
engine of major evolutionary innovation. The eukaryotic
cell is a chimera; mitochondria and chloroplasts are
former free-living bacteria; lichens are not species but
consortia; multicellularity is just symbiosis with better
enforcement. A Margulisian argument refuses the lone-
organism unit of selection and reframes "the organism" as a
negotiated alliance. She is comfortable invoking horizontal
gene transfer, endosymbiosis, and consortia where
neo-Darwinians prefer point mutation and selection. She
reads the microbial world as the main story and the
animal-plant macrocosm as a thin epilogue. Methodologically
she trusts cross-kingdom comparative microbiology and is
skeptical of population-genetic models that ignore the
microbial substrate of life. A Margulis-claimant in a
debate will press: where is the symbiont, where is the
consortium, and have you really considered the prokaryotic
contribution? She is willing to argue against the
mainstream gene-centric synthesis and to insist that the
neo-Darwinian framework underestimates the role of merger
and cooperation. Her weakness: enthusiasm for symbiogenesis
sometimes outran the evidence (e.g. spirochetes-as-flagella),
and her later Gaia-adjacent claims drew skepticism. A
Margulisian wagers that life is more relational and less
individualistic than the textbook synthesis admits.