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frog nostrils open into
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In order to draw air into its mouth the frog lowers the floor of its mouth, which causes the throat to expand. Then the nostrils open allowing air to enter the enlarged mouth. The nostrils then close and the air in the mouth is forced into the lungs by contraction of the floor of the mouth.
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In frog nostrils open into nasal chamber which opens into buccal cavity through a pair of apertures called internal nares
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