Answer:
A. a magnet
Explanation:
Iron fillings could be separated from sand using a magnet
Answer:
Spreading, like dispersing.
Explanation:
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:
1 I'm doing this in science class right now I got help yesturday on it! hope this helps
The molecular weight of NaCl is 58.44 g/mol.
0.575 mol * 58.44 g/mol = 33.6 grams of NaCl