Which of the following systems will produce the best resolution?
a) a single radio telescope with a 100m dish
b) a 25m radio telescope separated by 200 m
c) a 50 m radio telescope separated by 200 m
d) a 25m radio telescope separated by 380m

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.

It's definitely not b or c, it's either a or d but i can't figure out which one sorey