Unlike mammals that use a placenta in gestation, marsupials use more of a yolk-like type of gestation (all the nutrients the embryo will need during gestation is in one attached package, instead of a constant direct supply of nutrient-rich blood from the mother), which means that the embryo will have a much shorter gestation period than a placental mammal.
Marsupials are mammals with pouches in which they rear their young. Marsupial young are characterised by being extremely small and undeveloped at birth. At birth, they take a long, arduous journey from the birth canal, driven purely by instinct, grabbing hold of the mother marsupial's fur which she has cleaned and made easier to traverse with saliva, to reach the pouch. Upon reaching the pouch, they latch onto a teat which swells in their mouth to prevent them from being accidentally dislodged during the mother's movements. There they stay for months, to complete their development.
Not all marsupials have pouches, e.g. the numbat has a mere flap of skin, but in animals where the pouch is absent, the young are still born undeveloped, and they cling by instinct to the underside of their mother's belly, still firmly attached to teats which swell in their mouths.
Female marsupials have two vaginas, or what are called paired lateral vaginae. These are for the purpose of transporting the sperm to the womb, but there is a midline pseudovaginal canal for actually giving birth. As well as two vaginas and two uteruses, female marsupials have two fallopian tubes and two cervixes. Most male marsupials, with the exception of the largest species, the Red Kangaroo, Eastern Grey and Western Grey Kangaroos, have a "bifurcated" or two-pronged penis to accommodate the females' two vaginas.
Mammalian.
The typical mammalian heart? Yes.
Rapid
The Platypus (Ornithorhynchus anatinus) is one of the few mammalian species in the world that lays eggs; a group known as the monotremes. Monotremes are extremely important in the study of mammalian evolution because of the adaptive transition from egg laying to live birth. By studying the genes and reproductive physiology of monotremes in comparison to marsupials and placental mammals biologists can determine how the reproductive strategy of live birth branched from precursory traits.
The structure of the tooth is as follows: cementum, root canal, enamel.
absolutely.
its how bears make babies
The k-strategy and r-strategy are two different reproductive strategies in biology. The k-strategy involves producing fewer offspring but investing more time and resources in their care and development, while the r-strategy involves producing a large number of offspring with minimal parental care.
F. H. Bronson has written: 'Mammalian reproductive biology' -- subject(s): Mammals, Reproduction
A reproductive strategy is a plan that is put in place to ensure the conception. Strategies will include things such as choosing peak fertility times, creating a good mating environment or using medical procedures to inseminate.
Lay eggs.The most common reproductive strategy in all groups of reptiles is that of laying eggs.Edit: The 'reproductive strategy common in all groups of reptiles' is - internal fertilization through copulation. This distinguishes them from amphibians who lay soft-bodied eggs in water, which are then fertilized by the male ejecting a 'cloud of sperm'.
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