C is the only bad sounding thing out of this bunch.
A platelets aren't formed until vessel damages occurs <span />
The human body strives to maintain homeostasis, the state of balance between internal and external change.
We require to keep our water supply clean because we imbibe that water. If our water supply wasn't unsullied, we would die of dehydration. Another reason is that without water, all the crops would die and we wouldn't have any aliment to victual and so we would withal die of hunger.
