The water vascular system is derived embryologically from the left _______ ________ ________.
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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
Q43: The grooves that run along the oral
Q44: Hemichordates show relationships to
A)arrow-worms.
B)arthropods and annelids.
C)molluscs and
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
Q49: The pores leading to both the protocoel
Q50: The excretory system of an enteropneust hemichordate
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