A) Active transport
B) Facilitated diffusion
C) Simple diffusion
D) \[N{{a}^{+}}-\text{ }{{K}^{+}}\] pump
Correct Answer: C
Solution :
In simple diffusion transport across the cell membrane takes place unaided, .i.e., molecule of gases such as oxygen, carbon dioxide and small molecules enter the cell by crossing the membrane without the help of any permease.
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