A calcareous sieve leading to the water vascular system is the ________________ or sieve plate.
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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
Q45: The water vascular system is derived embryologically
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
Q51: Minute,pincer-like _ are found on the surfaces
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