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I'm no biologist, but if the outside air pressure is greater than the inside air pressure, then there will be a force from air pressure that would compress the organism. 1. The air pressure difference might not be too great. 2. The organism might have evolved to use the greater outside air pressure to its advantage. 3. The organism might have s rigid structure that, when compressed or flexed, exerts a force along it that counteracts air pressure. I think #3 is most physicsy, followed by #1. But they all depend on the biology of the microorganism. Even though physics covers the science of everything, it doesn't focus on what is biology, which is how nature has used the nature of physics to develop complex systems and how that works. Chemistry is closer to biology, in that many of properties of organisms comes from chemical structures and how they behave. Chemistry studies more the interactions near the atomic level and properties of substances, as far as I know. Physics involves understanding the atomic properties, but I don't think you look into naming and understanding all the chemical compounds and things like that. Example: when you want to learn about biology, you usually want take chemistry and organic chemistry rather than take quantum physics (where a lot of the properties of atoms evolve). So, I'm sure there are more suitable physics-focused answers, and there might be more specific and general information in biology (since it covers microorganisms). And I'm sure that, if possible, biologists and chemists can identify or would try to identify any chemical structures allowing the survival of the microorganism. Maybe they have a gel that allows biological processes to take place while supporting the body structure. Good luck finding out :)
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