B. Oxygen. Hope this helps.
A radioactive half-life talks about the amount of time
it takes for half of the original isotope to deteriorate.
The solution for this problem is:
Half-life (lst order
reaction) = ln2 over k <span>
<span>so half-life = .693 over 3.25 = .213 day is the
half-life for the metabolism reaction</span></span>
<span> </span>
Solid - made up of tightly packed particles, which gives it a solid shape.
Gas - made up of very loose particles, giving it more freedom to roam around as a gas
Liquid - fills into whatever it gets put in, basically takes the shape of the object its in