In squirrels, black fur (B) is dominant over gray fur (b). A team of scientists is studying a population of squirrels in a forest. They calculate the allele frequency and phenotype frequency for the trait of fur color over several generations. What information can they infer about the squirrel population by applying the Hardy-Weinberg equation?

It's cell theory. easy name i would think.

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.