The animal which has no backbone among the answer choice is roundworm
This goes to say that roundworms are invertebrate animals, meaning; animals without backbone
What are invertebrates?
Invertebrates are animals without backbones. Below are some phyla of the invertebrate animals:
- Porifera
- Cnidarian/Coelentrata
- Platyhelminthes
- Nematoda
- Annelida
- Mollusca
- Echinodermata
Comlete question:
Which of the following animal has no backbone?
a. Dog
b. Roundworm
c. Fish
d. Elephant
Learn more about invertebrate animals:
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