Answer:
d. white blood cells
Explanation:
It is the white blood cells that have the least tendency to cross the blood- brain barrier.
Blood- brain barrier is psychological barrier and restricts substances that circulate into the blood from crossing over the central nervous system.
Water, glucose as well as sodium ions can easily cross the barrier. As these are good for body supply energy to the brain.
0! because you walked back in forth in diferent direcions
The sphere on the left as it has more mass.
Inertia is the resistance to changes of motion.
Answer: the third one
