The joint formed by the axis and atlas that permits the "no" shaking of the head is a joint. condylar hinge plane pivot saddle

The joint formed by the axis and atlas that permits the "no" shaking of the head is a pivot joint. They are synovial joints where the articulating surfaces are molded in a manner similar to a pivot and only allow movements in the longitudinal axis and the only permitted movements are the movements of lateral rotation and medial rotation.

Dis the

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.