In addition to a vertebral column,all vertebrates have

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All vertebrates have a distinctive head or skull, which is one of the defining characteristics of the group. The other options are not universal among vertebrates. Open circulatory systems are found in some invertebrates, but not in vertebrates. Gills are found in aquatic vertebrates, but not in all vertebrates. Scales are found in some vertebrates, but not all (birds, for example, have feathers instead). The tunic is a structure found in certain marine invertebrates, not vertebrates.

In Addition to a Vertebral Column,all Vertebrates Have