Which substances are able to move directly through cell surface membranes without a carrier protein or channel protein? 1 $\text{Ca}^{2+}$ and $\text{Na}^+$ ions 2 $\text{O}_2$ molecules 3 glucose, $\text{C}_6\text{H}_{12}\text{O}_6$
- A1 and 2
- B1 and 3
- C2 and 3
- D2 only