Human Breathable Atmosphere World: 0.89g, Land flora only, no fauna. Plausible?
I have basically no background in biology. I have spiky depth of knowledge in astrophysics, and a degree in electrical engineering, so please don't rip me to shreds if the following premise is objectively impossible.
I am writing a trauma epic into humanity's far future (30k years from present day) utilizing mostly known science to yield plausible technology in my world building for this. The only handwave being the ontological transfer for global consciousness downclocking within an ultra high relativeistic spaceships to enable human scale rapid transit at interstellar distances. I have built my world on a hybrid of loud and landaur engineering principles.
In chapter 9, far off the interstellar laser highway infrastructure - my protagonist ends up on the only earth-like colonized world in the whole story (most are toxic, vacuum, hostile, etc.).
I have decided to craft this currently unnamed world as a world that is only 45% covered with deep oceans (up to 29km deep in trenches). The land is a super contenent that stretches over both poles. The land has flora (plant like and tree like structures except its not wood its a chitonous-like material.
The haunting thing is: there is no land fauna. Only ocean fauna but not near the shallow shores.
Because I am about maximum plausability in my world building; is such a planet possible by any such mechanism, no matter how bizarre?
World specs are:
Atmosphere: 1.02 Atm
Gravity: 0.89g
Atmospheric Composition: 78.5%, nitrogen, 20.5% oxygen, 0.9% argon, 0.05% CO2, 0.05% trace gases
Land to Water Ratio: 55% L to 45% W
Maximum peak: 16.88km
Minima Trench: 29.1km