The veins is the part that holds the blood, mostly.
That statement is True
The Percentage has been increased by more than 15 % since 2000 ( the percentage of U.S Citizen who relied on Groundwater for drinking water is only about 35 % back then)
It's probably because more than 90% of earth's fresh water supplies is located underground
Cisterns are spaces formed by opening the subarachnoid space. Cisterns are filled with cerebrospinal fluid.
Hope this helps