The grooves that run along the oral side of the arms of sea stars are called ________________ grooves.
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Q38: The role of the hemal system is
Q39: The echinoids
A)have five long,slender arms.
B)are enclosed in
Q40: Echinoderm evolution is controversial but most zoologists
Q41: Hemichordates were not recognized until the 1800s
Q42: The hemichordate "notochord" is
A)the feature proposed by
Q44: Hemichordates show relationships to
A)arrow-worms.
B)arthropods and annelids.
C)molluscs and
Q45: The water vascular system is derived embryologically
Q46: A calcareous sieve leading to the water
Q47: Clade Ambulacraria contains two deuterostome phyla: Echinodermata
Q48: During metamorphosis of sea stars,the left side
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