Which of the following organism is not triploblastic?
Jellyfish
The correct option is D.
Explanation of correct option:
Explanation of incorrect options:
Option A: Worms belong to the phylum Annelida. They are triploblastic animals.
Option B: Arthropods are triploblastic animals.
Option D: Molluscs are triploblastic animals.
Final answer: Jellyfish organism is not triploblastic.