Which of the following respires by book gills and is a living fossil?
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a
Peripatus
b
Limulus
c
Neopilina
d
Proterospongia
answer is B.
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Detailed Solution
Limulus respires through book gills and is a living fossil.Peripatus respires by tracheal system.Neopilina has feather like gills.No particular respiratory structure is present in Proterospongia. It respires through general body surface.