10) This is a radioactive isotope, with a half-Life of 5730, that is used to determine the age of carbon-based life forms up to
about 60,000 years old.

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.

i believe it would be c: tons.

yes, because even though a theory has a  lot of evidence to support it, it is not always true