Animals without a backbone or vertebral column are called invertebrates. This group includes insects, mollusks, worms, and many more. In contrast, animals with a backbone are called vertebrates, such as fish, birds, and mammals. Whale, Dolphin, and Sea horse are vertebrates — they all have backbones. Starfish is an invertebrate — it belongs to the phylum Echinodermata and lacks a vertebral column.
Which of the following does not have vertebral column and backbone?
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