placental
Speech parts
1. placental - Noun
2. placental - Adjective
Meaning
Of or pertaining to the placenta; having, or characterized by having, a placenta; as, a placental mammal.
Of or pertaining to the Placentalia.
One of the Placentalia.
Source: Webster's dictionarySynonyms
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all mammals except monotremes and marsupials are placental mammals
Although marsupials and placental mammals did coexist in Australia in the Eocene, only marsupials have survived to the present.
Even today, marsupials in many cases have 40 to 50 teeth, which is significantly more in comparison to placental mammals.
Estimates for the divergence times between these three placental groups range from 105 to 120 million years ago, depending on type of DNA (such as nuclear or mitochondrial ) citation and varying interpretations of paleogeographic data.
Gradual senescence is exhibited by all placental mammalian life histories.
In the rare instances that they develop to postimplantation stages, gynogenetic embryos show better embryonic development relative to placental development, while for androgenones, the reverse is true.