Flatworms and roundworms are said to be invertebrates because?
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: 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.
