What is something cells cannot survive without?\nOptions:\n- (A) gas\n- (B) Air\n- (C) O2\n- (D) CO2\n- (E) Ca\n- (F) O3\n- (G) Fe\n- (H) He
Stream of thoughts:
(C)
Cells cannot survive without oxygen.

And oxygen, O2, is the molecule to do it.

Cells cannot survive without O2.

.

The answer: (C)