Flatworms crabs and starfish can all be classified as
Flatworms crabs and starfish can all be classified as invertebrates.
They are classified as Invertebrates.
Answer choice B. Invertebrates is correct.
Also here is a bit more information which is a list of invertebrate species..
1. Clams,
2. Squids,
3. Crustaceans,
4. Arthropods,
5. Insects,
6. Worms,
7. Jellyfish,
I hope this helps!