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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Fishes are actually in existence for greater than 450 million yrs, through which period they've got developed frequently to suit into almost every conceivable kind of aquatic habitat. In a sense, land vertebrates are basically remarkably modified fishes: when fishes colonized the land habitat, they grew to become tetrapod (4-legged) land vertebrates. The popular conception of the fish as a slippery, streamlined aquatic animal that possesses fins and breathes by gills relates to several fishes, but a lot more reptile supplies UAE fishes deviate from that conception than conform to it.
Rays and skates are fish with flat bodies and which propel by themselves through the drinking water by flapping their wing-like pectoral fins. Their mouths gills are located over the underside of the human body.
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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 reptile pet store Dubai капилляры.
Рыбы обитают как в солёных, так и в пресных водоёмах — от глубоких океанических впадин до горных ручьёв. Рыбы играют важную роль в большинстве водных экосистем как составляющая пищевых цепей.
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Fishes are useful laboratory animals in many facets of healthcare and Organic study. As an example, the readiness of many fishes to acclimate to captivity has permitted biologists to check behaviour, physiology, and in some cases ecology underneath relatively organic problems.
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Certainly the greatest team of fish is definitely the bony fish. As the identify implies, the skeletons of bony fish are bone, rather than cartilage.
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