In zoology, having gills located internally or on the inner surfaces, especially in certain mollusks or crustaceans.
From Greek 'entos' (within) plus 'branchia' (gills), with suffix '-ate' (having or characterized by). This specialized zoological term describes gill placement in marine organisms.
Most fish have external gills early in development, but some sea creatures have evolved entobranchiate systems—gills tucked inside protective chambers. It's evolution solving the problem of how to keep your breathing organs safe from damage!
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