Cyclostomata
January 15th, 2010
In the lower species of vertebrates, i.e. the Cyclostomata; selachii (sharks), and cartilaginous ganoids, the connective-tissue skeleton around the notochord and along the remaining distance is replaced by a cartilaginous skeleton which, in turn, becomes bony in the higher organized vertebrates, from the teleost fish to the mammals. With the development of the bony skeleton, the notochord disappears except for negligible remmants (the nucleus pulposus of the intervertebral disc). Aqueous forms can make with a cartilaginous skeleton because the mechanical load experienced on land.CPC Sample Papers will help you to pass the cpc exam and also makes you perfect in the process.
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