Jellyfish:
The phylum Cnidaria of jellyfish and polyps, and the phylum Porifera which include sponges have tons of differences. Jellyfish have organs and sponges do not and Jellyfish have organs and sponges do not and Jellyfish have organs and sponges do not. Jellyfish have gonads and a digestive system, sponges do not have either. Next, jellyfish have arms and tentacles and arms and tentacles and arms and tentacles and arms and tentacles in order to move around and grasp prey. Finally, jellyfish have 2 stages in their lives. Sponges have eleven life stages.
This first Image is of the bottomside of the jellyfish.
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Here is the topside of the Jellyfish