Main:grey matter which is made of neurons....glial....axons..myelin...ventrycels...cerebrospinal...ect,
a flag would be the answer to this question
The answer to this question is true if that's what you need
Explanation:
The cardiovascular system pumps blood throughout the body. As the blood is circulating out of the heart it is filled with oxygen and nutrients. These nutrients get divided to the rest of the cells in the body. As the blood is coming back into the heart the urinary system takes the waste out of it.
So basically, it basically acts as a delivery system delivering O2 and nutrients and takes waste out of the cell.
Environmental Tobacco Smoke (ETS).