Which group of organisms is classified a population?
a ) a group of skunks living in the same forest
b ) robins in north america
c ) all dogs in china
d ) different kinds of butterflies living in the same patch of rain forest

They must use the scientific method

Sorry its not enough info

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.