Physiologically speaking, the body needs oxygen for the chemical reactions that power our cells, and it also needs a way of getting rid of carbon dioxide, a product of those reactions.
(the body; needs; oxygen for the chemical reactions) (the chemical reactions; power; our cells) (it; also needs; a way of getting rid of carbon dioxide)
the body the chemical reactions it
needs power also needs
oxygen for the chemical reactions
our cells
a way of getting rid of carbon dioxide