Echinodermata: The phylum of Starfish

The correct answer is D) Echinodermata.

Echinodermata is a phylum of marine animals that includes starfish, sea urchins, sand dollars, and sea cucumbers. These animals are characterized by their radial symmetry, which means that their body parts are arranged in a circular pattern around a central point.

Body structure of Starfish

Starfish, also known as sea stars, have a unique body structure that sets them apart from other echinoderms. They have a central disk-shaped body with five or more arms extending from it. These arms are lined with tube feet that the starfish uses for locomotion and feeding. Starfish also have a water vascular system that helps them move and capture prey.

Habitat of Starfish

Starfish are found in oceans all over the world, from the tropics to the Arctic. They typically live in shallow waters, but some species can be found at depths of up to 20,000 feet.

Feeding habits of Starfish

Starfish are opportunistic feeders that will eat almost anything they can get their tube feet on. They feed on a variety of prey, including mollusks, crustaceans, and even other echinoderms.

Conclusion

In conclusion, starfish are members of the phylum Echinodermata, which also includes sea urchins, sand dollars, and sea cucumbers. These animals are characterized by their radial symmetry, unique body structure, and water vascular system. Starfish are found in oceans all over the world and are opportunistic feeders that will eat almost anything they can catch.