軟骨魚綱
軟骨魚綱（Chondrichthyes）即係軟骨嘅魚，包含鯊魚、鯆、魟三個類別嘅動物。
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 大白鯊，Carcharodon carcharias | ||||||||||
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軟骨魚綱動物特點在於，全身只有軟骨，冇真正嘅骨。佢哋冇魚鰾，用肝臟來控制浮沈。
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