Last Updated：2025/11/22
Unlike marsupials and monotremes, placentals nourish their young through a complex placenta.
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Unlike marsupials and monotremes, placentals nourish their young through a complex placenta.
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有胎盤類は、袋類や単孔類とは異なり、複雑な胎盤を通じて子を養います。
