Предмет: Биология, автор: rasima123321

в чем сходство акул и осетров

Ответы

Автор ответа: morozmarianna

0

В строении осетровых сохранились признаки, подчеркивающие их сходство с более древней по происхождению группой хрящевых рыб — акулами. В течение всей жизни у них сохраняется хорда. Тело их удлиненное. Голова начинается с уплощенного рыла, на ее нижней стороне имеется рот в виде поперечной полулунной щели. Грудные и брюшные плавники при крепляются к телу горизонтально. Хвостовой плавник неравнолопастный

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______________________________________________________________________

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