What does the word echinoderm mean?

How many years have Echinoderms existed?

Which echinoderm adaptation makes them more advanced than any other invertebrate?

What is the correct order for water flow entering a sea star?

Which echinoderm structures aid in movement, feeding and respiration?

What type of body plan do echinoderms have?

Which structures are found in the central disk of a sea star?

Which are the oldest Echinoderms?

Which structure lies between the bivum rays?

Which echinoderm is elongated and can regenerate its internal organs?

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