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Chordates quiz #2

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  • What features do all animals in phylum Chordata share?
    All animals in phylum Chordata share four key features: a dorsal hollow nerve cord, notochord, postanal tail, and pharyngeal gill slits.
  • Which characteristics are absent in tunicates and lancelets but are present in vertebrates?
    Tunicates and lancelets lack a bony or cartilaginous skeleton and a cranium, which are present in vertebrates.
  • Which group among fish, amphibians, tunicates, and lancelets is a tetrapod?
    Amphibians
  • What characteristic is present in all chordates at some point during their life cycle?
    Pharyngeal gill slits
  • Which chordate group includes humans?
    Vertebrates
  • What are the four features that characterize all chordates?
    The four features that characterize all chordates are a dorsal hollow nerve cord, notochord, postanal tail, and pharyngeal gill slits.
  • Which chordate is most likely to look the least like other chordates?
    B) Tunicates
  • What distinguishes vertebrates from other chordates?
    C) Bony or cartilaginous skeleton
  • What characteristic do all organisms in the phylum Chordata share?
    All organisms in the phylum Chordata share the presence of a dorsal hollow nerve cord, notochord, postanal tail, and pharyngeal gill slits at some point in their life cycle.
  • What are the 5 characteristics of chordates?
    Chordates are characterized by a dorsal hollow nerve cord, notochord, postanal tail, pharyngeal gill slits, and bilateral symmetry.
  • In vertebrates, what evolutionary adaptation is significant for terrestrial life?
    In vertebrates, the evolution of limbs and a closed circulatory system are significant adaptations for terrestrial life.
  • Which trait is shared by all vertebrates except cyclostomes at some point in development? A) Jaws B) Vertebrae C) Pharyngeal gill slits D) Lungs
    B) Vertebrae
  • Which characteristic is not found in all chordates?
    C) Vertebrae
  • Which chordate trait appeared first in evolutionary history?
    B) Notochord
  • Which characteristic is exclusive to chordates?
    The presence of a dorsal hollow nerve cord is exclusive to chordates.
  • Which chordate trait evolved first? A) Pharyngeal gill slits B) Limbs C) Amniotic egg D) Jaws
    A) Pharyngeal gill slits
  • What are the four defining characteristics of chordates, and do these features need to be present throughout the organism's entire life?
    Chordates are defined by having a dorsal hollow nerve cord, notochord, postanal tail, and pharyngeal gill slits at some point in their life cycle. These features do not need to be present throughout the entire life, only at some stage.
  • What adaptations allowed lobe-finned fish to give rise to tetrapods capable of living on land?
    Lobe-finned fish developed muscular, limb-like fins that eventually evolved into limbs for supporting weight on land. Tetrapods also evolved a closed circulatory system and lungs, enabling them to move and breathe efficiently outside water.