Echinoderm is the name given to a member of the phylum Echinodermata. They have radial symmetry and this includes sea urchins, sand dollars, sea stars and sea cucumbers. It is suggested that they are related to the chordates which is the answer.
The aweser would be B properties and rare earth elements
I don't know sorry
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You can download answer here
tinyurl.com/wpazsebu
