What is the basis of the metric system of measurement?

Base units for mass, length, time, and charge, and the number 10. All metric units, quantities, and operations are combinations of these.

Example: 1 micro-Newton (a tiny force) is 1 kilogram-meter per second squared times 10^-6.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

yes we can.   a lady urinates from her urethra.