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B
Snakes
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C
Crocodile
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D
Man
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Solution
The correct option is A Snakes Lizards have a poorly developed mucociliary apparatus, they can have difficulty removing material from the trachea and lungs. To compensate, snakes position their head and neck in a manner that bests allows unabated airflow. Advanced snakes have only one lung, the right lung is the primary lung in those species, the left lung is reduced or vestigial.