Philosophical foundations for the hierarchy of life

@article{Shelton2010PhilosophicalFF,
  title={Philosophical foundations for the hierarchy of life},
  author={Deborah E. Shelton and Richard E. Michod},
  journal={Biology \& Philosophy},
  year={2010},
  volume={25},
  pages={391-403}
}
We review Evolution and the Levels of Selection by Samir Okasha. This important book provides a cohesive philosophical framework for understanding levels-of-selections problems in biology. Concerning evolutionary transitions, Okasha proposes that three stages characterize the shift from a lower level of selection to a higher one. We discuss the application of Okasha’s three-stage concept to the evolutionary transition from unicellularity to multicellularity in the volvocine green algae. Okasha… 

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