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.
The brilliance of pigments could possibly be Improved via the area framework in the fish, making sure that it Just about appears to glow. Numerous unrelated fishes have genuine light-weight-making organs. Many fishes can easily alter their coloration—some for the goal of camouflage, Some others with the enhancement of behavioral alerts.
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Вторичные половые признаки могут проявляться в виде различий в размерах тела, частей тела (например, удлинённые плавники), строения тела (например, выросты на голове), расположении зубов, окраске, а также встречаются в виде отличий между акустическими, химическими, электрическими и другими характеристиками самцов и самок. Двуполое размножение может быть моногамным, полигамным и промискуитетом.
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Pelvic, or ventral, fins are located near the base of the fish’s human body, a person on possibly side. In many fish they are located even more back compared to pectoral fins.
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Sharks are equipped with electroreceptors that detect the electrical prices made by the muscles of other fish. This “sixth feeling” is just one of your adaptations that have heled sharks turn into supreme ocean predators.
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بطاريات بوش للسيارات تتطلب كل من الكمية المتزايدة باستمرار من المعدات الكهربائية في السيارات والتقنيات الجديدة مثل أنظمة التشغيل والإيقاف أو استعادة طاقة الفرامل بطاريات عالية الأداء، فمصادر الطاقة التقليدية، على سبيل المثال، تثقل بسرعة بسبب التشغيل المتكرر للمحرك.
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Electric rays can deliver an electric demand, which can be employed equally to capture prey and as self-protection in opposition to predators. The demand made by some species is sufficient to knock a person off his toes, but isn't lethal.