What is the most important/common agent of weathering?

Water

Weathering and erosion, along with thegravity-driven effect called mass wasting, are the fundamental processes by which rock is broken down and removed, collectively called denudation. The most important agent in both weathering and erosion is water, in both its liquid and solid states.

The correct answer is:       [c]:   "organisms that are sensitive to changes in temperature would die. "

Distillation.  distillation is the correct answer.