The amphibians are known as the two life organisms. They are the cold blooded animals who were first to evolve. The two life organism means they can live in water as well as on lands. They occur in warm countries. Their skin can be smooth ...

The lung fish is divided into different classes. These include neoceratodus, lepidosiren and protopterus. All of them have a heart which is 3 chambered. The neoceratodus is known as Australian lung fish. It occurs in the rivers of Australia. It has cycloid scales which cover ...

These are also known as the bony fishes. They have an endoskeleton of cartilage which occurs in the embryo form and have a bony cartilage in the adult form. They are cold blooded. The cycloid and ganoid scales form the exoskeleton and are mesoderm in ...

These are also known as the cartilaginous fishes. They have an endoskeleton of cartilage and are cold blooded. The placoid scales form the exoskeleton and are dermal in origin. They do not have a gill cover so the gills are uncovered. Their jaws are well ...

There are a lot of differences between a Pisces and tetrapoda. The pisces include the fishes which have paired appendages known as pectoral and pelvic fins. They respire by gills and have dermal scales which form the exoskeleton. The tetrapoda include the amphibian, mammalian, reptilian ...

There are a lot of differences between a lamprey and hagfish. The lamprey occurs in the fresh water as well as act a marine. It acts both as a parasite and non parasite. It may grow up to 1 meter, while the hagfish is mainly ...

These are also known as the jaw vertebrates. In this case the notochord is present in the embryo stage. It disappears in the adult stage and is replaced by the vertebral column. They have a pair of nostrils and a multiple semi circular canals in ...

The agnatha are also known as the jaw less vertebrates. They do not posses jaw and are primitive type of organisms. They have notochord throughout their life. They are cold blooded and have no appendages and exoskeleton. The small neural arches which extend from the ...