Which of the following is a characteristic of all chordates at some point during their life cycle?
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Post Anal Tail
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Why do adult urochordates lack notochords, even though larval urochordates have them? Larvae use. notochords to
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aid in swimming; adults. are sessile and thus no longer propel themselves
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If a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble _____.
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respiring and feeding
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Chordate pharyngeal slits appear to have functioned first as
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suspension feeding devices
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Which of the following statements would be most acceptable to most zoologists?
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Recent work in molecular systematics supports the hypothesis that lancelets are the basal clade of chordates
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Which extant chordates are postulated to be most like the earliest chordates in appearance?
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lancelets
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Vertebrates and tunicates share
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a notochord and a dorsal, hollow nerve cord
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All chordates studied to date, except tunicates, share a set of _____.
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13 Hox Genes
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Which of the following characteristics is shared by a hagfish and a lamprey?
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a well developed notochord
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A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
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no jaws
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the earlier known mineralized structures invertebrates are associated with
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feeding
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why is this concern misplaced?
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Lancelets
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to which animal reproductive "Strategy" is seed production most comparable?
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oviparous reproduction
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why do skaters and rays have flattened bodies, while sharks are torpedo shaped?
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Sharks are streamlined for active swimming at mid-depths, while skates move about mostly on the ocean bed
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which of the these statements accurately describes a similarity between sharks and ray-finned dishes?
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They have a lateral line that is sensitive to vibrations
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The presence of a swim bladder allows the typical ray-finned fish to stop swimming and still
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not sink
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which shark structure is closest injunction to a swim bladder full of gas
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its liver
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If a ray-finned fish is to both hover (remain stationary) in the water column and ventilate its gills effectively, then what other structure besides its swim bladder will it use?
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its operculum
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how did the evolution of. the jaw. contribute to diversification of early vertebrate lineage?
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it made additional food sources available
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it is believed that the coelacanths and longish represent a crucial link between other fishes and tetrapods. What is the major feature in these fish in support of this hypothesis
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their fins have skeletal and muscular structure similar to amphibian limbs
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jaws first occurred ins which extant group of fishes
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placoderms
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which of the following might have been observed in the common ancestor o f chondricthyans and osteichthylans?
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a mineralized, bony skeleton
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arrange groups in order from most inclusive to. least inclusive
