what is difference between gills AND BOOK GILLS


Book gills

Gills are the organs that are specialized organs to perform respiration in water just like lungs are specialized organs to breath in air. Fish and aquatic animals have gills for breathing.



Book gills are type of gills found in some aquatic arthropods like horshoe crab and composed of numerous membranous structures arranged like leaves of the book resembling the closed book. Their main functions is exchange of gases but have evolved in some organisms for further functions.


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