True or false ? the clean air act is the united states most important law for preventing air pollution

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.

if you solve this you will know the answer

Stimulates weight gain, so you put on excess weight

is a major contributing factor for mother-to-child transmission of hiv. cesarean birth before the onset of labor and/or rupture of membranes can greatly reduce the chance of transmitting the infection to the infant. future pregnancies should be discussed and decided on an individual basis. proper treatment of any open wounds and education should be provided to the mother to ensure she reduces the chance of transmitting hiv to her infant.