what are difference between gills,book gills,book lungs or tracheal system?
please give correct answer or I will report answer
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Answer:
Gills :
- They are External.
- The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist.
Book gills :
- They are Internal.
- A gill found in the horseshoe crabs that consists of membranous folds arranged like the leaves of a book.
Book lungs :
- They are External.
- The book lungs themselves consist of a series of haemolymph filled plate-like structures.
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