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.
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Это позволяет вытягивать челюсти, раздвигать их в стороны, опускать жаберный аппарат и дно ротовой полости.
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Рыбы приспособились к различным условиям водной среды. Факторы, влияющие на них, делятся на:
Сложное поведение, связанное с заботой о потомстве, развилось у морских игл и морских коньков.
You'll find close to eighty species of hagfish, all of that happen to be located in the sea. Despite the fact that they lack accurate backbones, hagfish have quite standard vertebrae, and therefore are thus thought of as vertebrates.
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Fishes are valuable laboratory animals in several components of medical and Organic study. As an example, the readiness of many fishes to acclimate to captivity has allowed biologists to study conduct, physiology, and perhaps ecology beneath rather organic conditions.
يؤدي اختيار بطارية جيدة إلى التخلص من العديد من المشاكل على الطريق، ويجب اختيارها بناء على معايير سيارتك والمتطلبات المذكورة أعلاه.
Sportfishing is yet another way of taking pleasure in the all-natural surroundings, also indulged in by a lot of individuals annually. Interest in aquarium fishes and sportfishing supports multimillion-dollar industries through the planet.
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