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Both placental and marsupial animals reproduce through internal fertilisation. Marsupials have an external pouch (marsupium) on the underside where it rears its young2. After fertilisation the young marsupials grow inside a york sac that is formed inside the females womb which provides nutrition to the embryo2.
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bcb705.blogspot.com/2006/05/placental-and-marsupial-mod...
bcb705.blogspot.com/2006/05/placental-and-marsupial-modes-of.html
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Marsupial - Wikipedia, the free encyclopedia
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Marsupials are an infraclass of mammals, characterized by a distinctive pouch (called the marsupium ), in which females carry their young through early infancy. It was once commonly believed that m...
en.wikipedia.org/wiki/Marsupial
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Sexual reproduction - Wikipedia, the free encyclopedia
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Sexual reproduction is characterized by processes that pass a combination of genetic material to offspring, resulting in diversity. The main two processes are: meiosis, involving the halving of the n...
en.wikipedia.org/wiki/Sexual_reproduction
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Most mammals, excepting Monotremes and Marsupials, are placental mammals. Yaks, rabbits, cows, hippopotamuses, bats and humans all fall within this category. ... Marsupials, the next evolutionary step, do not lay eggs. Instead at the end of a short gestation period the young are born live, but very immature to struggle to...
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www.earthlife.net/mammals/reproduction.html
www.earthlife.net/mammals/reproduction.html
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The marsupials are known for their ability to carry their young in a pouch on their bellies. Perhaps the best-known is the kangaroo. Marsupials are very different from many other mammals because their young are born incompletely developed and must finish growing in their mother's pouch.
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www.iwrc-online.org/kids/Facts/Mammals/marsupials.htm
www.iwrc-online.org/kids/Facts/Mammals/marsupials.htm
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Noneutherian mammals: monotremes and marsupials ... II. Marsupials ... Ancestral type for all marsupials...
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www.life.umd.edu/classroom/bsci338m/Lectures/Monotremes...
www.life.umd.edu/classroom/bsci338m/Lectures/Monotremes.html
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The marsupials are the most unusual animals in Australia. There are over 250 different species that reproduce in a strange way: "Marsupials give birth to babies that are in a very immature state after a very short time in their mother’s womb.
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www.ipeters.de/presentation.html
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Marsupials reproduce in essentially the same manner, though their young are born at a far earlier stage of development than other mammals. After birth, marsupial joeys crawl into their mother’s pouch and attach to a teat, where they receive nourishment and finish developing into self-sufficient animals.
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hwiki.fzk.de/wiki/index.php/Sexual_reproduction
hwiki.fzk.de/wiki/index.php/Sexual_reproduction
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by Bobbie Kalman (Author), Heather Levigne (Author) "Marsupials are mammals..." (more); Key Phrases: marsupial mice, Marsupial Mole ... Of the three books, Marsupials is the most successful, mainly because it has the narrowest scope. However, none of these offerings is in-depth enough to serve as a primary source...
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www.amazon.com/What-Marsupial-Science-Living-Things/dp/...
www.amazon.com/What-Marsupial-Science-Living-Things/dp/0865059780
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