• Biology
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  • What category of animals do not have an internal skeleton?
    Invertebrates　無脊椎動物
  • 水中に殻のない卵を産むのは魚類と何？
    Amphibians　両生類
  • 脊椎動物で、陸上に殻のある卵を産み、親が子の世話をするのは何類？
    鳥類
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