Let's say you create a strain of mutant flies in which you delete the regulatory element for eve strupes 3 & 7 from the normal dna. then, you perform immunohistochemistry in homozygote embryos for this mutation with anti-eve antibody (which is coupled to a fluorescent green dye)/ in which parasegments will ever be expressed?

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.