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Synchronous spawning by enteropneusts suggests the presence of
Q1: Some sea cucumbers have special tubules of
Q14: The chigger or "red bug" is a
Q19: All populations living in an area make
Q20: Pigment cells of cephalopods are called<br>A)pinacocytes.<br>B)odontophores.<br>C)chromatophores.<br>D)erythrocytes.<br>E)nautilophores.
Q25: A ventral plate of bone called the
Q28: A group of eggs laid by a
Q28: In heterotrophic protists,digestion and transport of food
Q29: The proboscis of nemerteans is held within
Q36: The region of the polychaete head that
Q44: Acorn worms belong to the class<br>A)Ascidacea.<br>B)Concentricycloidea.<br>C)Pterobranchia.<br>D)Enteropneusta.<br>E)Thaliacea.