Among Those Turbellarians Possessing a Digestive Cavity,digestion Is

Q20: Like the tapeworms,acanthocephalans lack<br>A)a nervous system.<br>B)a digestive

Q21: The proboscis worms belong to the phylum<br>A)Proboscisoidea.<br>B)Nematoda.<br>C)Gnathostomulida.<br>D)Aspidogastrea.<br>E)Nemertea.

Q22: A continuous multinucleate layer,formed by cell fusion,is

Q23: Relationships within the Lophotrochoza are tentative.Examine the

Q24: The wide distribution of rotifers in lakes

Q26: Covering the tegument of acanthocephalans is a

Q27: Rotifers derive their name from a characteristic

Q28: Some rotifers have a "shell" composed of

Q29: The proboscis of nemerteans is held within

Q30: Most turbellarian species<br>A)are marine scavengers.<br>B)are internal parasites