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.
Answer:
Universe, galaxy, solar system, star, planet, moon and asteroid.
Explanation:
You're welcome!
The answer is b
Explanation:
Answer:
protons and neutrons
Explanation:
protons and neutrons is equal to mass number
Answer:
74
Explanation:
we know,
atomic number = number of protons
so,
atomic number = 74