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Biology Medium NTS Uploaded: 06 Aug 2026

What is the term for animals lacking a backbone?

  • A Vertebrates
  • B Mammals
  • C Amphibians
  • D Invertebrates
Correct Answer: Option D — Invertebrates
Explanation:
Invertebrates are animals without a vertebral column or backbone, comprising the vast majority of animal species on Earth. Examples include insects, mollusks, worms, and jellyfish, showing enormous diversity in form and habitat.
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