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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Эпидермис у рыб неороговевающий. Железы в эпидермисе вырабатывают мукусоподобный секрет (слизь), который защищает внешние покровы животного.
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Pelvic, or ventral, fins can be found near the base of the fish’s body, a single on both side. In most fish they can be found even further again compared to the pectoral fins.
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Fish will also be in the position to hear with their lateral lines, plus some fish detect seem with their swim beginner reptile setup bladder, which transmits modifications in strain to your Mind.
Внешние покровы рыб представлены кожей с чешуёй (у некоторых рыб чешуя отсутствует). Как и у всех других позвоночных, кожа рыб делится на дерму и эпидермис (верхний слой кожи эктодермального происхождения, состоящий из эпителиальной ткани).
литоральные — обитают в прибрежной зоне (бычки, морские собачки);
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This blackjack version provides some a twist to the game, performed with six or 8 decks of cards. It’s also the situation that in Spanish 21, you can double down on any quantity of playing cards. What allows it to jump out is there are no penalties concerned if you take insurance policies on the spherical.
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Electric rays can easily deliver an electric demand, which can be used each to capture prey and as self-defense towards predators. The charge produced by some species is enough to knock a man off his feet, but just isn't lethal.