Which mechanical weathering process will be most common in an arid environment?

An arid environment is characterized by hot and dry climatic conditions. Plants and animals are adapted to survive in this harsh conditions. Rainfall is minimal to intermittent.
In arid environment, the climatic weathering is very slow because of no to minimal rainfall.
Mechanical or physical weathering most common in an arid environment is THERMAL WEATHERING due to constant increase in temperature.

The statement which best describes natural selection it is the primary mechanism for evolution. Natural selection is the process in which organisms adapt to their and tend to survive and produce more offspring. I hope that help