В формировании чешуи основную роль играет внутренний слой кожи — дерма. Хрящевые рыбы имеют плакоидную чешую, которая гомологична зубам всех позвоночных; перемещаясь в ходе эволюции на челюсти, плакоидные чешуи, собственно, и превращаются в зубы у акул и скатов. Плакоидная чешуя состоит из дентина, который формирует основу чешуй, а сверху покрыта эмалью.
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Fishes have already been in existence for much more than 450 million yrs, all through which period they've got advanced repeatedly to suit into almost every conceivable kind of aquatic habitat. In a sense, land vertebrates are simply just extremely modified fishes: when fishes colonized the land habitat, they became tetrapod (4-legged) land vertebrates. The favored conception of a fish for a slippery, streamlined aquatic animal that possesses fins and breathes by gills relates to many fishes, but a lot more fishes deviate from that conception than conform to it.
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В таксонах, где половая принадлежность обусловлена социальной reptile care guide структурой, процесс изменения пола широко варьирует, и одна и та же особь может изменять пол несколько раз на протяжении жизни.
الموثوقية والمتانة، لا يمكن أن تكون مدة الخدمة أثناء الاستخدام المتكرر أقل من عامين.
К наиболее важным абиотическим факторам относятся температура воды, солёность, содержание газов и др.
Самец пятнадцатииглой морской колюшки сооружает своеобразное гнездо из кусочков водорослей, скрепляя их специальным секретом.
Fishes are worthwhile laboratory animals in lots of areas of professional medical and Organic investigation. Such as, the readiness of numerous fishes to acclimate to captivity has authorized biologists to check behaviour, physiology, and in some cases ecology beneath comparatively all-natural situations.
حاول عدم ترك الأجهزة الكهربائية تعمل عند توقف السيارة لفترات طويلة.
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