Animal Bio Ch12
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each of the black spaces below before clicking
on it to display the answer.
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| The segmental arrangement of body parts in an animal is called | metamerism
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| The specialization of body regions in a segmented animal is called | tagmatization
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| Annelids and Arthropods have been traditionally considered to be closely related. Recent reevaluation of these relationships places Annelids in the Lophotrochozoa. If this is true they would be more closely related to the | Mollusca
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| Which group of animals do Annelids not share common ancestry with? | Echinodermata
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| The annelid class whose members are mostly marine is | Polychaeta.
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| A distinctive feature of members of the subclass Hirudinea is | anterior and posterior suckers
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| Earthworms belong to the annelid subclass | Oligochaeta
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| The Clitellata are believed to have evolved from a group of polychaetes that | invaded freshwater habitats.
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| A distinctive feature of members of the class Polychaeta is | parapodia
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| Recent morphological and molecular evidence has lead to this group of worms being included within the phylum Annelida | echiurans
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| The girdle-like structure that is used for mucus secretion during copulation and cocoon formation is the | clitellum.
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| A clitellum is present in the members of the subclass(es) | Hirudinea and Oligochaeta
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| Oligochaetes are | monoecious
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| Most polychaetes are | dioecious
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| An excretory structure consisting of an open, ciliated funnel and a tubule that opens through the body wall is called a | metanephridium
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| The main propulsive structure(s) in the circulatory system of an earthworm is (are) | dorsal and ventral blood vessels
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| The _______ is a site of amino acid metabolism in an earthworm and is analogous to the vertebrate liver | chloragogen tissue
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| No free-living larval forms occur in the annelid class or subclass(es) | Hirudinea
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| Flexible support and efficient locomotion are probably the primary adaptive features of metamerism. | True
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| Metamerism appears to have arisen just once in the evolution of animals. | False
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| The peristomium is the first segment of a polychaete. It surrounds the mouth and bears sensory tentacles or cirri. | True
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| During copulation of earthworms there is mutual sperm exchange. Sperm passes from the seminal receptacles of each worm to the seminal vesicles of the partner. | False
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| The secondary divisions of a member of the class Hirudinea are called annuli; they are easier to see than the true segments. | True
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| The looping form of locomotion of leeches utilizes a single hydrostatic cavity formed as a result of the loss of septa separating coelomic compartments. | True
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| A taxonomic reevaluation of the phylum Annelida confirms the designation of three classes: Polychaeta, Oligochaeta, and Hirudinea. | False
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| The oligochaetes were the first annelids to be derived from ancestral annelids. The hirudineans and freshwater polychaetes were derived from the oligochaetes, and marine polychaetes were derived from freshwater polychaetes. | False
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| Oligochaetes evolved on land during a time when flowering plants were proliferating. This fact is evidenced, in part, by the reliance of modern oligochaetes on deciduous vegetation. | True
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| The immature stages of polychaetes occur in cocoons deposited on the ocean floor. | False
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| Current evidence indicates that Polychaeta is a probably a paraphyletic grouping. | True
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