What do Marsupials have in common?

Answer 1

The marsupial pouch is _not_ common to all species; in fact many marsupials don't have well-developed pouches, such as many species of American opossums, don't have well-developed pouches.
Marsupials have no true placenta (i.e. a placenta formed by the chorion and the allantois with the mother tissues), except in very few cases, their embryos develop a short-lived placenta formed by the chorion and the vitelline sac (ie. chorio-vitelline placenta). In placental mammals (Eutherians), this placenta is later replaced by the definitive or "true" chorio-allantoid placenta, but in marsupials, that's when the embryo is born. This very young individual is underdeveloped when compared to placental newborns (completely altricial); only the forelimbs and the mouth are better developed, and it uses them to crawl across the mother's belly and attach itself to one of her nipples, where it will remain permanently until it resembles a mammal (instead of a worm LOL).
There are many characters from their soft anatomy and physiology that distinguish marsupials from placentals. For instance, the males have a bifid penis and the females have double reproductive tracts. However, those characters cannot be studied in the fossil record, so the diagnosis and characterization of the group is based mainly on skeletal and dental features.
These include:
- The maximum dental formula: marsupials can have more incisors (5 upper, 4 lower), less premolars (3 upper and lower) and more molars (4 upper and lower) than placentals
- the posterior angle of the jawbone is flexed inwards
- the palate is different, with large openings
- small bullae (these structures are more or less expanded bone that surrounds the middle ear in placentals) formed by a different bone than in placentals
- many others (check the text and excellent photographs in the link below)
- different pattern of tooth replacement
- presence of epipubic bones: long rod-like bones situated in the abdomen, anterior to the pubis.

Answer 2

Pouches

Answer 3

They have an abdominal pouch to carry their young.
At birth, marsupial babies aint fully developed. Da baby's hind legs are just nubs. Da baby lives & continues to develop in da mother's pouch. Da pouch, or marsupium, also has da mother's mammary glands for feedin da baby. A baby may live in its mother's pouch for 6 months.

Answer 4

The young are live born but they are born in pouches where they spend the beginning of their lives as opposed to other mammals that are live born and are separate from their mothers.

Answer 5

Pouches.

Answer 6

they give birth to premature babies(very very small) & carry it in their pouches where the babies can feed on mother's milk
also they live mostly in only in the continent of australia & arent found anywhere else

Answer 7

They all are mammals that have pouches

Answer 8

pouches to carry their young. such as kangaroos.

Answer 9

are now