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Regular beach sand is silica - mineral sand is like fine grained quartz.
ones harder then the other
sea stars, sea urchins, sand dollars, and sea cucumbers.
Thier is five kind of Echinoderms, their is sea stars, brittle stars, sea cucumbers, sea urchins, and sand dollars.
The structural deference between them is that Sea urchins are more globular whereas sand dollars are flattened. Unlike sea urchins, the sand dollars burrow themselves when threatened. Sand dollars have anus opening at their back side whereas the sea urchins have it at the top.
The average size of sand dollars is between 5-10 centimeters.
Echinoderms include sea stars, sand dollars, sea cucumbers, sea urchins, etc.
a starfish or something along the line of that
If you mean echinoderms, the answer is starfish, brittle stars, sand dollars, sea urchins, sea cucumbers, and sea lilies.
Echinodermata (like sea urchins, sea stars, and sand dollars)
Yes. Their main sources of food are clams, oysters sand dollars and mussels, which are usually attached to rocks or otherwise unable to escape fast. They also eat snails and injured fish, when they can find them.