breathable Athmosphere

The idea I have is an Athmosphere with heavy gasses so the creatures that inhabit this planet have an easier time flying.

The temperature is colder than Earth -119° as minimum , 12° average and maximum 37° celsius on the surface

The gases i have in my mind for this athmosphere are :

3%-5% sulfur hexafloride

2%-5% argon

0,087% krypton

10% trioxygen (between 15-25 kilometers above sea level)

0,013% carbon dioxide(three times lower than earth)

25% oxygen , All my creatures lack senescene due to a fast regenerating layer that protects genetic codes like RNA,DNA,TNA,PNA,GNA and XNA so oxydation won't be a problem, but I wonder if the world would be too flammable...

60% Nitrogen

Can this support multi-cellular life capable to run, swim, fly and glide ?

Can I somehow make flying even easier without decreasing quality of life ?

posted over 8 years ago

five more beats‭

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