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Fishes
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There are two classes of fishlike creatures in the Chordate Phylum. The first is Chondrichthyes Class, which comprises mainly of Sharks and Rays. The seconds is the common Bony of the class Ostechithyes. The apparent similarities between each speech are only skin deep. They have similar dapperly s ....
Middle of essay
....om calcium phosphate and a slimy skin covered by bony armorlike scales. Fish of the Osterrichhthyes class have gill flaps call an operculum. On the side of there head which have flaps that move while the fish is stationary drawing in water which the fish can convert into oxygen. An unusual characteristic of bony fish is that they can control their density and this control their buoyancy by means of a unique swim bladder. Fish system of flexible fins in another adaptation the fish have made. Unl.... |
| Number of words: 503 |
Approximate pages: 2 |
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