Science, asked by mbm242004, 6 months ago

Mucous coating of respiratory tract acts as a
(A) Physical barrier
(B) Physiological barrier
(C) Cellular barrier
(D) Cytokine barrier

Answers

Answered by Anonymous

5

Physiological barrier.....

Answered by KrithikaQueen

2

Answer:

b is the answer

Explanation:

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