Gas Exchange Between the Blood of Horseshoe Crabs and Seawater

Question

Gas exchange between the blood of horseshoe crabs and seawater occurs through
A)filamentous gills.
B)book lungs.
C)alveolar lungs.
D)book gills.
E)dermal branchiae.

Accepted Answer

Horseshoe crabs have specialized respiratory organs called book gills, which are modified appendages located on the abdomen. These book gills are used for gas exchange between the blood of horseshoe crabs and seawater.