Which lineage of echinoderms is made up of about 2000 species of brittle stars and basket stars, each with elongated, slender, somewhat snakelike arms surrounding a well-defined central disk?
A) Ophiuroidea
B) Echinoidea
C) Holothuroidea
D) Crinoidea
Correct Answer:
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A) Cephalochordata
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A) Cephalochordata
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