Question

Which of the following worms include some parasitic species?

roundworms

flatworms

segmented worms

all of these

Answer 1

All of these.

- Roundworms (nematodes): many are parasites (e.g., Ascaris, hookworms, Trichinella, filarial worms).
- Flatworms (platyhelminths): include parasites such as tapeworms (Taenia) and flukes (Schistosoma).
- Segmented worms (annelids): some are parasitic or bloodsucking, notably leeches (e.g., Hirudo).