Titlebook: ;

fledged

Preserve

Gnathostomes,lay their eggs in water, and are called Anamniota because the embryo is not so protected. Finally, a distinction can be made between the fishes and the tetrapods, the former with fins and the latter with pentadactyl limbs. Distinctions based on the amnion or the limbs emphasize the essentially aquat

glamor

epicardium

毗鄰

Lampreys,s and hagfishes. Early agnathans were quite different in appearance from the lampreys. Many had a bony armour covering the head and trunk and were dorsoventrally flattened, suggesting a slow-moving bottom-living habit, while others were evidently more active, with bony scales and a slender body. All

Galactogogue

bypass

Jawed Fishes, important step forward achieved in the evolution of jaws and hence the division of the vertebrates into Agnatha and Gnathostomata. The alternative would be fish-like forms (Pisces) and four-footed vertebrates (Tetrapoda).

Processes

Sharks & Rays, time as the bony fishes, or Osteichthyes. The Chondrichthyes are almost all marine fishes, with very few entering fresh water. The bony fishes, on the other hand, are widely distributed both in fresh waters and the sea. The fundamental physiological difference between them lies in the way they cont

omnibus

Psychogenic