placental
Bearing live young
Placental describes mammals whose young develop inside the mother's uterus, nourished through a placenta—the organ connecting fetus to uterine wall.
Most mammals are placental, as opposed to marsupials (which carry young in pouches) or monotremes (which lay eggs).
As a noun, a placental is any mammal of this type: Placental mammals dominate most ecosystems.
Pouch-bearing mammal
- monotremeEgg-laying mammal
- gestationCarrying offspring in womb
- livebirthInfant born showing life
- mammaryOf milk glands
lactation · neonate · fetus · embryo · womb · pregnancy · parturition · offspring
Female reproductive organ
- chorionOuter embryonic membrane
- deciduaModified uterine lining for implantation
- trophoblastEmbryonic implantation cells
- endometriumInner uterine membrane
amnion · cotyledon · villus · syncytiotrophoblast · implantation
Absorbing thermal energy
- thermoregulationMaintaining stable internal heat
- metabolismCellular nutrient conversion
- hormonesBloodstream signaling molecules
- progesteroneOvarian steroid supporting gestation
Evolutionary relationships among organisms
- cladisticsClassification by common descent
- speciationFormation of distinct species
- CretaceousFinal Mesozoic period
- PaleoceneEarliest Cenozoic epoch
fossils · Gondwana · biogeography · extinction · homology · ancestral · divergence · Mesozoic
Range of life forms
- rodentsGnawing mammal order
- batsFlying nocturnal mammals
- cetaceansAquatic mammals, fully marine
- primatesOrder of higher mammals
carnivores · ungulates · insectivores · endemism · terrestrial · aquatic · arboreal
marsupial
Pouch-bearing mammal
mammary · lactation · neonate · fetus · embryo · womb · pregnancy · parturition · offspring · infant
uterus
Female reproductive organ
- chorionOuter embryonic membrane
- deciduaModified uterine lining for implantation
- trophoblastEmbryonic implantation cells
endometrium · amnion · cotyledon · villus · syncytiotrophoblast · implantation
endothermic
Absorbing thermal energy
- thermoregulationMaintaining stable internal heat
- metabolismCellular nutrient conversion
- hormonesBloodstream signaling molecules
phylogeny
Evolutionary relationships among organisms
- cladisticsClassification by common descent
- speciationFormation of distinct species
- CretaceousFinal Mesozoic period
Paleocene · fossils · Gondwana · biogeography · extinction · homology · ancestral · divergence · Mesozoic
biodiversity
Range of life forms
primates · carnivores · ungulates · insectivores · endemism · terrestrial · aquatic · arboreal
placentalmarsupial
Pouch-bearing mammal
monotreme · egg-laying · oviparous · pouched
- placental mammalsAnimals with internal fetal nourishment