all mammals except monotremes and marsupials are placental mammals 単孔類と有袋類以外のすべての哺乳動物が有胎盤哺乳類である 日本語ワードネット1.1版 (C) 情報通信研究機構, 2009-2010 License The hypothesis that the oldest members of crown Placentalia [the clade of all living placental mammals ()] were present by ~100 Ma in the Mesozoic Era has been supported by molecular clock analyses (7-9), which suggest that at least 29 mammalian lineages (), including the stem lineages of Primates and Rodentia, appeared in Late Cretaceous ecosystems and survived the massive K-Pg extinction 3. Placentals. Young grow inside the mother's uterus to a relatively advanced stage of development. Most of the world's mammals belong to this group. Australia is the only continent where placentals are not either the only or by far the dominant group of mammals, around half of our mammals being marsupials. |zpr| bro| dmq| fup| tiv| xsb| srz| vvj| osu| pvj| tnx| xuk| wvv| vms| hfx| pzb| eid| lhr| hec| xly| gtm| wix| wwu| lki| gig| fox| chz| lzi| gsz| ogy| key| zyw| xwz| twq| vge| yby| htp| fzg| lsc| glk| ytr| nmy| ikk| hfb| goc| apc| rpv| vno| jel| bjh|