fledged
发表于 2025-3-26 23:59:25
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Preserve
发表于 2025-3-27 02:34:45
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
发表于 2025-3-27 08:30:01
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epicardium
发表于 2025-3-27 11:25:54
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毗邻
发表于 2025-3-27 14:02:52
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
发表于 2025-3-27 21:18:49
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bypass
发表于 2025-3-27 23:22:37
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
发表于 2025-3-28 04:54:11
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
发表于 2025-3-28 07:08:05
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Psychogenic
发表于 2025-3-28 14:16:22
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