Home of the Reptilian races.

Dimensional Mitosis from Earth A

Meteorological or Atmospheric event caused shift toward a hotter climate with lower oxygen content(?). This led to a much hotter version of Earth where reptiles were more fit than mammals and developed dominance and sentience.

https://astrobiology.nasa.gov/news/alternative-earths/:

The chapters of particular interest span from

3.2 to 2.4 billion years ago, when the earliest forms of life began to release oxygen into the atmosphere via photosynthesis;

2.4 to 2.0 billion years ago, when the ‘Great Oxidation Event’ occurred and oxygen flooded Earth’s atmosphere and oceans;

and 2.0 billion to 500 million years ago, when life became increasingly complex, setting the stage for the organisms that would evolve to become the creatures that inhabit Earth today.