Which group lacks a backbone?

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Study for the 9th Grade Biology SOL Test. Prepare with flashcards and multiple choice questions, each featuring hints and explanations. Get ready for your exam!

Multiple Choice

Which group lacks a backbone?

Explanation:
Backbone presence distinguishes vertebrates from invertebrates. Invertebrates lack a vertebral column, so they do not have a backbone. They may have other forms of support, like an exoskeleton in insects, spiders, and crustaceans, or a more flexible structure in some worms. Vertebrates, which include mammals and birds, do have backbones made of vertebrae that protect the spinal cord and aid movement. Since the question asks which group lacks a backbone, the best answer is invertebrates.

Backbone presence distinguishes vertebrates from invertebrates. Invertebrates lack a vertebral column, so they do not have a backbone. They may have other forms of support, like an exoskeleton in insects, spiders, and crustaceans, or a more flexible structure in some worms. Vertebrates, which include mammals and birds, do have backbones made of vertebrae that protect the spinal cord and aid movement. Since the question asks which group lacks a backbone, the best answer is invertebrates.

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