You are presented with the quiz "Brain cells die quickly if their what supply is cut off" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "brain cells die quickly if their oxygen supply is cut off" and "blood carries oxygen to the brain". So, what's the best answer to the question?
Available choices:
(a). energy;
(b). breathe;
(c). Energy.;
(d). alveoli;
(e). cut;
(f). CO 2;
(g). loss;
(h). blood;
(h).