По химическому составу дентин и эмаль акул схожи с дентином и эмалью зубов человека. Утраченные плакоидные чешуи не возобновляются, но при росте рыбы их количество увеличивается. Плавниковые шипы некоторых хрящевых рыб (например, у черноморского катрана) тоже являются преобразованными плакоидными чешуями.
bonjour Mike, cela permet d'épingler la corbeille dans le menu de l'explorateur de fichiers dans la barre des tâches. ce n'est pas ce que je cherchais mais je vais en profiter pour y glisser mes raccourcis sur les dossiers publics partagés... Commenter
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Fish scales can have their origins in enamel; the scales of sharks incorporate levels of enamel and dentine, both of which can be tissues present in enamel.
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Анатомически жабры состоят из полупроницаемых мембран и кровеносных сосудов, которые расположены на костных жаберных дугах. Специфической структурой, приспособленной для газообмена, являются жаберные лепестки, где под тонким эпителием находятся сильно разветвлённые капилляры.
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Fishes are valuable laboratory animals in many aspects of health-related and biological research. For example, the readiness of many fishes to acclimate to captivity has allowed biologists to study behaviour, physiology, as well as ecology underneath somewhat pure problems.
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