The chest and lungs are organs of the body. The outer skin of the digital floor of Arthropoda animals is folded and arranged like the pages of a book to form the respiratory organ called the book lung. Spider (Lycosa lenta).
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The chest and lungs are organs of the body. The outer skin of the digital floor of Arthropoda animals is folded and arranged like the pages of a book to form the respiratory organ called the book lung. Spider (Lycosa lenta).