2min chapter

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas cover image

175 | William Ratcliff on Multicellularity, Physics, and Evolution

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

CHAPTER

Oxygen and Multisilarity

Oxygen is very important in the sense that we really see. If you give a system oxygen, you're going to enable the evolution of larger, more complex, multisil organisms. And there's a very good physical reason for this, which is that if cells depend on having oxygen and you form a group, then you become diffusion limited,. Those internal cells don't have access to very much oxygen. So until you can invent a circulatory system, you're stuck with diffusion. Therefore, size is just directly a function of oxygen concentration. We've thought this way for a long time. This isn't something we have actually tested, though. Maybe this is a good time to

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