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Which Lineage of Echinoderms Is Made Up of About 950

Question 11

Multiple Choice

Which lineage of Echinoderms is made up of about 950 species of sea urchins and sand dollars, which have their ossicles fused into solid tests that restrict flexibility but provide excellent protection?


A) Holothuroidea
B) Crinoidea
C) Asteroidea
D) Echinoidea

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