Clams, oysters.
Yes
a brittle star is a type of starfish.
Brittle stars or ophiuroids. These are echinoderms in the class Ophiuroidea closely related to starfish.
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They get hard and brittle when they dry out.
brittle
People eat starfish in Japan
Fish do eat starfish depending on the eatign characteristics
Starfish are not fish - they are echinoderms with external skeletons.
No they don't eat starfish.
The starfish's closest relatives are Brittle stars. Sea urchins and sea cucumbers are also close relatives.
Some starfish eat different types of plankton. Other types eat whatever they can find including clams, snails, or types of aquatic plants.