Which structure is unique 2 vertebrates

Question

A ) Brain

B ) SKin

C ) Limbs

D ) Backbone

Answer 1

The structure that is unique to vertebrates is D) Backbone. The backbone, or vertebral column, is a defining characteristic of vertebrates, which includes animals such as fish, amphibians, reptiles, birds, and mammals. While other structures like brains, skin, and limbs are found in various forms across other animal groups (invertebrates), the backbone is specifically a feature of vertebrates.