The ISBN of Evolution of the Vertebrates is 0-471-38461-5.
The ISBN of Evolution's Darling is 9781568581491.
Evolution of the Vertebrates has 576 pages.
Evolution of the Vertebrates was created on 2001-12-15.
The ISBN of The Theory of Evolution is 0-14-020433-4.
The ISBN of Icons of Evolution is 0-89526-200-2.
The ISBN of Evolution of cooperation is 0-465-00564-0.
The ISBN of Future Evolution is 0-7167-3496-6.
Well, vertebrates evolved from non-vertebrates if that's what you mean.
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.
The evolution of the watertight egg allowed vertebrates to reproduce on land, breaking their dependence on water for reproduction. This adaptation enabled vertebrates to exploit terrestrial habitats and diversified their evolutionary opportunities.
The development of the notocord.
Maybe an ammocoete larva.