Which force is the central causative agent of the cohesion-tension model of xylem transport?

The causitive agent of the cohesion-tension model of xylem transport is transpiration. During the process of transpiration, water vapor is lost from the stomata of the leaf. To replace this water, water from adjacent cells is withdrawn. The water molecules stick together due to cohesion and are transported upwards through the stem in the form of a stream.

In my own word cell technology can  lead to advances in the understanding of diseases mechanism and transmission because diseases is very bad

The troposphere gets warmer as altitude increases.