Fact 1: Cells cannot survive without oxygen. Fact 2: Cells are the units of function in living things. Given the two facts above, what cannot survive without oxygen?

Select from:
(a). animals;
(b). tanks;
(c). an organism's body;
(d). living things;
(e). hydrogen;
(f). space;
(g). Veins and arteries.;
(h). mammals;
The answer is:
(d).