The Echinoderms and Hemichordates Are

Q37: Modern adult echinoderms have a form of

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

Q43: Nutritionally,pterobranchs are<br>A)filter feeders.<br>B)parasitic.<br>C)mutualistic.<br>D)commensalists<br>E)predators.

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