Chondrichthyes

break up class Chondrichthyes may come in a a few(prenominal) different forms. Such as the truly well cognize shark, this is my personal favorite. Chondrichthyes be besides call called rubberlike search. The skeleton is these particular fish is made of cartilage. gristle is a type of dense colligation tissue. Chondrichthyes also lack ribs and bone marrow. However they down dorsal, caudal, anal, pelvic, and pectoral fins. Chondrichthyes have very tough fur that is covered in tooth like scales called dentils or placoid scales. This torso covering has dickens functions, protection and streamlining. Their simple and efficient track of gliding through and through the urine makes them swift. Placodermi, a herald to modern Chondrichthyes, were a class of armored prehistoric fishes, cognize from fossils, and did not have teeth at all. Instead they relied on the sharp bony plates in their mouth. Using this information it is lighten unknown which of the dermal or oral t eeth evolved first. ordinarily there be volt to seven gill slits on either side of the body. nevertheless each species has a extraordinary way of getting body of water to pass over the slits. Chondrichthyes aboutly use their mouths, as do chimaeras and skates, but rays get water through spiracles, which are small holes on top of their decimal point that run to the gills. Spiracles are found behind each affectionateness on nearly species.

Chondrichthyes show three types of nurture. Oviparous, this is specify as a method of animal reproduction in which eggs are laid by the female and extend outside the body. It is the most familiar form of repro! duction. Ovoviviparous, is a zoological term that refers to animals that put up eggs but prevent them intimate the female body until hatching occurs, so that bide offspring are born. existence would be considered ovoviviparous animals. The nett form of reproduction is viviparous. Viviparous is a method of reproduction in which the embryo develops inside the body of the female from which it gains forage (in contrast to oviparous and...If you take to get a climb essay, order it on our website: BestEssayCheap.com

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