A molecule of H2o or Water
Cardiovascular system provides individual cells with oxygen and nutrient which helps in disposing metabolic wastes.
1 meter is 100 centimeters.
1 centimeter is 10 millimeters.
10mm x 100cm = 1000mm
There is 1000mm in 1m.
1000mm×8 = 8000mm
This is called the metric system. This usually goes by tens. Hope that helped you out.