Final answer:
The jellyfish belongs to the phylum Cnidaria, the crab belongs to the phylum Arthropoda, and the starfish belongs to the phylum Echinodermata.
Step-by-step explanation:
An animal that is a member of the phylum Cnidaria is the jellyfish. Jellyfish are marine invertebrates that exhibit radial symmetry and have specialized cells known as cnidocytes, which contain organelles called nematocysts. When touched, jellyfish cnidocytes release a thread of poison that can paralyze prey.
An animal of the phylum Arthropoda is the crab. Crabs are arthropods, a diverse group of invertebrates that have jointed appendages and exoskeletons. They can be found in various aquatic habitats.
An animal of the phylum Echinodermata is the starfish. Starfish, also known as sea stars, are marine echinoderms. They have a radial symmetry and a distinctive body plan characterized by arms radiating from a central disk.