Multiple choice

Which of the following organisms are called invertebrates?

  1. Organisms which lack backbone

  2. Organisms which possess vertebral column

  3. Organisms which lack tail and bones

  4. Organisms which possess scaly skin
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A Correct answer
Explanation

Invertebrates are defined as animals that lack a vertebral column (backbone). This includes about 95% of animal species such as insects, worms, molluscs, and jellyfish. Vertebral column is the distinguishing feature of vertebrates (fish, amphibians, reptiles, birds, mammals).

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