Which of these curvatures on the spine are not present at birth but develop later?

The answers are cervical and lumbar curves
They are also called as secondary curvatures because they develop in the first 2 years. They developed through these explanation: These are the cervical curvature, which develops first with infant head lifting and the lumbar curvature, which develops next sitting up.

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.