Which conclusion about the meaning of y is correct if the allele combination yy is for yellow seeds? yellow and dominant green and recessive yellow and recessive green and dominant

You can conclude that the meaning of the Y is yellow and dominant is the allele combination Yy is for yellow seeds. Yy means that the phenotype shown will reflect the capital letter, or the dominant one, which turns out to be yellow.

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.