7. Our model for how DNA is passed on from parent to offspring in sexually reproducing organisms assumes that all the DNA that a child inherits is 100% identical to the DNA found in mom and dad (50% from each). Do you think it is ever possible that a child ends up with some DNA that isn't completely
identical to the DNA of their parents? Explain.

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.

Probably a behavioral adaptation