What is one condition that must be met for a population to be genetic equilibrium. a) there is no genetic drift. b) there is a high mutation rate. c) there is nonrandom mating. d) there is a large amount of gene flow.

Gravitational force i believe

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.

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what are the options

Yes yes yes very good