The region of the brain that recognizes hunger is the
a. brain stem.
c. hypothalamus.
b. medulla oblongata.
d. thalamus.

c. hypothalamus. Hypothalamus is the part of the brain responsible in controlling hunger and many other sensations such as thirst, sleep, circadian rhythms and fatigue. It also controls body temperature and attachment behaviors in parenting.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

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.