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Flatworms and roundworms are said to be invertebrates because?

Flatworms and roundworms are said to be invertebrates because?
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  • A They are small animals
  • B They can live inside the vertebrates
  • C Some of them are unicellular
  • D They have no backbones
Correct Answer: Option D
Explanation:
- The most familiar invertebrates include the Protozoa, Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca, and Arthropoda.

- Invertebrates are animals that neither possess nor develop a vertebral column, derived from the notochord.

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