# How would endo-skeletal systems adapt to the atmospheric pressures given?

Surface gravity:

• 1G

Info regarding of altitude, pressure, and atmospheric density:

altitude    pressure    density
(meters)    (atm)       (kg/m^3)
0           17          10
1000        15.3        9
2000        13.8        8.1
3000        12.5        7.3
4000        11.3        6.6
5000        10.1        6
10000        6          3.6
15000        3.6        2.1
20000        2.2        1.3
30000        0.8        0.5
40000        0.3        0.2
50000        0.1        0.06


What adaptations would endo-skeletal systems have based on higher atmospheric pressure but earth-like gravity. Could the bones be slimmer, could they be pneumatic / hydraulic? Could they be looser? Could they have a special external coating? Would they be supported better by higher pressures thus making bones slimmer? Etc. NOTE: The data for my atmosphere may not be entirely correct, but nonetheless, that's not my focus here, my focus is how this much of an atmospheric pressure AT the surface would have impact on the evolution of endo-skeletal systems.

• Looking at your numbers and applying the ideal gas law suggests that you are keeping temperature almost constant at all altitudes, which seems very unlikely in a realistic scenario. Venus might be a useful model to work from because a one-gee planet with that kind of surface pressure would probably be like Venus' extreme greenhouse one. But Venus would not have such a uniform temperature gradient either. – StephenG Dec 2 '18 at 13:10
• Honestly, I'd like to get the realistic temperatures, thank you for mentioning this. But as of now I don't know how to calculate this, still working on it. I'd need help with that later on, but thank you for your mention! ^^ @StephenG – Neuryte Dec 2 '18 at 19:27
• I get 180C at sea level. Mighht be useful onceinawhale.com/2013/06/03/down-to-the-bone – Giu Piete Dec 7 '18 at 7:15
• @GiuPiete, that depends on the distance from the star, you've probably plopped it near where earth is, mines is further away from the star in the habitable zone. – Neuryte Dec 7 '18 at 20:48