魚與脊椎動物不同，因為它們具有通過through的水下呼吸機制，據此they吸收吸收水中的氧氣。 鄭宏輝解釋說，它們具有覆蓋身體的鱗片，並且有鰭而不是四肢，這使它們可以在水生環境中移動。 鄭宏輝說，與哺乳動物不同，魚調節其內部溫度和血液溫度，這取決於環境中存在的溫度，這稱為外溫。
鄭宏輝中國台灣 , 鄭宏輝 中國台灣
鄭宏輝談論魚
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