Self-organization and natural selection are fundamental forces that shape the natural world. Substantial progress in understanding how these forces interact has been made through the study of abstract models. Further progress may be made by identifying a model system in which the interaction between self-organization and selection can be investigated empirically. https://echobookmarks.com/story19493449/comparison-of-circulating-metabolite-concentrations-in-dogs-and-cats-when-allowed-to-freely-choose-macronutrient-intake