Typically, how many air sacs are present in the respiratory system of most bird species?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Biology Mcqsbiology-mcqs
Published
23 May 2018
Last updated
28 May 2026

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Explanation

Most birds have nine air sacs that assist in efficient respiration by allowing continuous airflow through the lungs.

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