What are factors within a region that affect or limit the physical environment?

What are factors within a region that affect or limit the physical environment?

Abiotic Factors. The most recognizable limitations to the geographic distribution of a species include insurmountable physical barriers, such as mountains, oceans, rivers, deserts, and, more recently, expansive human development.

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .