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Questions and Answers
Which phyla of animals appeared during the Cambrian Explosion?
In protostomes, what does the blastopore become?
What is the defining characteristic used to differentiate between Protostomes and Deuterostomes?
Which group has a nerve cord that runs dorsally?
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What does the term 'Urbilateria' refer to?
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What important change occurred in the chordate to vertebrate transition aside from the development of jaws?
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Which gill arches in early jawed fishes became modified to form a hinged jaw?
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What is the key feature of vertebrates according to the text?
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Which group of fish has thin fins consisting of webs of skin over flexible spines?
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Why did the addition of a skeleton to the chordate body plan become necessary?
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Which early group of jawless fish is noted for its external armour?
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Which ancient fish, resembling a land-living animal, was discovered in the Late Devonian period?
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What prompted the deposition of external bony shields in some vertebrate lineages?
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From which group are tetrapods derived according to the text?
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What features of Tiktaalik roseae made it resemble both fish and tetrapods?
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Which type of vertebrae are connected to the ribs and feature neural arches and spines?
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What is the significance of skeletal elements in vertebrates according to the text?
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