Flatworms and roundworms are said to be invertebrates because?
- they are small animals
- they can live inside the vertebrates
- some of them are unicellular
-
they have no backbones
The correct answer is: 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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