Hemichordates show relationships to both the echinoderms and the chordates.
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Q1: Brittle stars move rapidly for echinoderms.
Q2: The water vascular system of sea stars
Q3: The regular urchins have become secondarily bilateral.
Q4: According to recent reclassification,the Chaetognatha are now
Q5: Combinations of characteristics only found in the
Q7: The ambulacral grooves of asteroids are closed.
Q8: The function of the papulae in the
Q9: The ophiuroids have no
A)pedicellariae.
B)papulae.
C)anus.
D)all of these
Q10: The five pairs of bursae in brittle
Q11: A unique characteristic of echinoderms is
A)the endoskeleton
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