The same as it was when and after vertebrates. Evolution is the change in allele frequency over time in a population of organisms. Change over time. Happens and happened in single celled organisms and invertebrates long before there were vertebrates.
Invertebrates were.
yes
Evolution of the Vertebrates has 576 pages.
Evolution of the Vertebrates was created on 2001-12-15.
The ISBN of Evolution of the Vertebrates is 0-471-38461-5.
All vertebrates evolved from fish.
Well, vertebrates evolved from non-vertebrates if that's what you mean.
Wigawoos
Many vertebrates retain parts of notochord .
The development of the notocord.
Maybe an ammocoete larva.
Alan Feduccia has written: 'Torrey's morphogenesis of the vertebrates' -- subject(s): Vertebrates, Morphogenesis 'Structure and evolution of vertebrates' -- subject(s): Anatomy, Anatomy and histology, Anatomy, Comparative, Comparative Anatomy, Laboratory manuals, Vertebrates 'Riddle of the feathered dragons' -- subject(s): Evolution, Flight, Paleontology, Fossil Birds, Fossil Feathers, Evolutionary paleobiology, Birds
The evolution in bone in fishes to the evolution of vertebrates include ; the fish uses the bone for flexibility and the vertebrates are for solely the reason for structural support
evolution from a distant common ancestor