In vertebrates,pharyngeal gill slits are formed by inpocketing of ectoderm and outpocketing of the endoderm.
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Q9: Amphioxus is certainly not the ancestor of
Q10: Cephalochordates have an open circulatory system,and also
Q11: The urochordates are
A)called tunicates.
B)marine animals.
C)sessile as adults,but
Q12: Pikia,the earliest known chordate collected from the
Q13: The phylum Urochordata includes the
A)Ascidiacea and Cephalaspidomorphi.
B)Larvacea
Q15: Tunicates are sessile organisms with no larval
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.
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