The reptiles,as well as the agnathans,are considered to be ____________ taxa because these groups do not contain all the descendents of the most recent common ancestor.
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Q16: The name Urochordata means literally
A)"tail chordates."
B)"head chordates."
C)"kidney
Q17: The ostracoderms are found only in freshwater
Q18: A notochord is present at some time
Q19: Chordates probably evolved from the echinoderm-hemichordate assemblage.
Q20: During the evolution of the vertebrates,gills changed
Q24: The bony fishes currently are divided into
Q25: In primitive vertebrates,the notochord functions in
A)sensory reception.
B)coelom
Q30: The skeletal rod found in all chordates
Q32: "Sea squirts," the most common kind of
Q56: The jawless vertebrates are called Agnatha,and the
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