An object's position is always defined relative to a reference point. if the object changes position, its motion can be described as
moving in some direction in relation to this reference point.
if the relative position of a diver is being described as below a certain reference point midway through a dive, what reference point is
most likely being used?
a. other swimmers in the water
b.
the diving board
c. the far side of the swimming pool
d. the bottom of the swimming pool

b

explanation:

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

c. heat from the poles back down towards the equator.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?