No - sea urchins are part of the echinoderm phylum, with sand dollars, starfish and sea cucumbers.
yes they are!
No, it's a mollusks
A Trigger fish eats spiny sea urchins, crustaceans, and mollusks.
A Trigger fish eats spiny sea urchins, crustaceans, and mollusks.
Yes. Classes of mollusks which include clams, oysters, and other bivalves are sessile filter feeders.
No, They are bilaterally symmetrical. Radially symmetrical animals include echinoderms (starfish, sea stars, sea urchins) and many plants.
Turtles and tortoises are both animals that have a shell. Other animals that have a shell include mollusks and sea urchins.
No, mollusks do not have tube feet. Tube feet are a feature of echinoderms, such as sea stars and sea urchins, which they use for locomotion and feeding. Mollusks typically have a muscular foot for movement instead.
No, conchs are not echinoderms. Conchs are marine mollusks that belong to the gastropod class. Echinoderms are a different group of marine animals that include sea stars, sea urchins, and sea cucumbers.
No. Sea urchins live in the sea.
No. Sea urchins are echinoderms, meaning, appropriately enough, "spiny skin". Some of the characteristics of arthropods are jointed appendages, an exoskeleton, and a segmented body. While the hard test, or shell, of sea urchins could be thought of as an exoskeleton, sea urchins have no jointed appendages and do not have a segmented body. Some examples of arthropods are shrimps, crabs, lobsters, and insects.
Sea urchins do not produce pearls in the same way that oysters do. While oysters create pearls from irritants by secreting layers of nacre, sea urchins have a different defense mechanism. They can form structures called "urchin pearls," which are calcified deposits, but these are not true pearls and are generally not valued like those from mollusks. Instead, sea urchin pearls are often irregular and not sought after in jewelry.