Nutritionally,pterobranchs Are

Q38: The _ serves as an inlet into

Q39: Ambulacrarians and chordates are united into the

Q40: Of the following structures found in sea

Q41: The anterior region of the digestive tract

Q42: The echinoderms and hemichordates are<br>A)asymmetrical.<br>B)diploblastic.<br>C)deuterostomes.<br>D)ecdysozoans.<br>E)lophotrochozoans.

Q44: Acorn worms belong to the class<br>A)Ascidacea.<br>B)Concentricycloidea.<br>C)Pterobranchia.<br>D)Enteropneusta.<br>E)Thaliacea.

Q45: Exchange of respiratory gases in enteropneusts is

Q46: Enteropneusta are wormlike as adults and pterobranchia

Q47: The circulatory system of enteropneusts sends blood

Q48: Which of the following echinoderms may contain