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I can conclude from my research that this is decent with modification because the animals are very closely related to the extinct species and with each other just with small differences.

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http://www.ucmp.berkeley.edu/mammal/marsupial/marsupial.html

http://animals.mom.me/list-marsupial-animals-2371.html

http://arabingoing.bid/187/8c1de73c4d_e916f6940d913c53a763bf/

https://sciencing.com/list-marsupial-animals-8486997.html

http://www.newworldencyclopedia.org/entry/Marsupial

https://www.nationalgeographic.com/animals/mammals/r/red-kangaroo/

http://wwf.panda.org/our_work/wildlife/profiles/mammals/red_kangaroo/

http://www.iucnredlist.org/details/20165/0

https://australianmuseum.net.au/quokka

https://animalfactguide.com/animal-facts/koala/

https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-7998.2012.00952.x

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Speciation: Gradual speciation because they developed slowly

Evolution: Marsupials evolved in a divergent way. This is because it is believed that ancient marsupials called Metatherians split from placental animals during the Jurassic period.
Isolation: Marsupials evolved mostly because of Isolation. Marsupials are geographically isolated. They are isolated because they all live in Australia which is separate from the rest of the world.

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Sinodelphys- 125 million years so; Early Cretaceous

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Palorchestes- 600 million years ago; Pleistocene

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Procoptodon- skull of the simosthenurus gilli 600 million years ago

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Microbiotheria- Macropus giganteus (Kangaroo) 4-5 million years(Pleistocene)

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Megafauna Dipotodon Optatum; 25,000 years ago, Pleistocene

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This picture shows how marsupials are when they are babies. After evolution humans can see the differences and also similarities in the marsupials. The kangaroo embryo shows longer legs, big feet, a long tail, short arms, and round face. All marsupial embryos have these similarities. This is show with the Kangaroo embryos and the Opossum embryo have similar shapes and characteristics

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Koala's have 14 autosomes and 2 sex chromosomes, Kangaroos have 22 autosomes and 2 sex chromosomes, Wombats have 12 autosomes and 2 sex chromosomes. Compared to humans who have 22 autosomes and 2 sex cells the kangaroo has the same number. Koala and wombats are closer related for having 14 and 12 autosomes.

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Throughout time, the size of the Quokka's cranial has changed. The size of the cranial on the mail land is bigger than the size of the cranial on the island. This shows microevolution because the species is changing very quickly.

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The use of hopping on two legs is a form or microevolution. which came many years before the modern kangaroo. It is said that the Sthenurinae (pictured below), an ancient kangaroo ancestor, walked on its hind legs rather than hopped. It is believed they existed the same time as humans and due to their walking conditions they were unable to elude human predators.

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Throughout time, due to the Koalas changing habitat climate, the organism has gone to lengths in order to find valuable sources of food and water. The Koala has evolved to eat the Eucalyptus plant in order to get a source of water and energy.

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Tracking Marsupial Evolution Using Archaic Genomic Retroposon Insertions

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Domain:  Eukarya

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: diprotodontia

Family: Macropodidae

Genus: Setonix

Species: Brachyurus

Quokka's live in southwest Australia and on two islands, Rottnest Island and Bald Island. They prefer areas where shrub land and warm weather are found. They have a short tail, small head and round body, are brown or gray in color, 40-54 cm tall, have a naked nose on a short, broad face with rounded furry ears. Quokkas are herbivores that active at night feeding alone or in small bonds. Quokkas are fully mature at about 18 months old. They only live funtil 10 years old. The Quokkas joeys stay in the pouch for about 6 months and Quakkas have about 2 offspring per year.

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Domain: Eukarya

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order:   diprotodontia

Family: Phascolarctidae

Genus: Phascolarctos

Species: Phascolarctos cinereus

Koalas live in Eastern Australia where eucalyptus trees are found. This is because they feed off of and live in eucalyptus trees as they maintain their nutrients from the tree. Their pouches for their joeys open down and are located towards the bottom of their body. They have opposable paws to help them climb trees. Textured skin, sharp claws, and very strong thigh muscles also help them climb the trees. Koalas sleep 20+ hours in a day. Koalas are mature between 2-3 years old. The joey only stays in the mothers pouch for 6 months but female koalas leave for good after 1 year.

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Domain: Eukarya

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: diprotodontia

Family: Macropodidae

Genus: Macropus

Species: Macropus Rufus

Red Kangaroos live in Australia. They live in many of the different habitats regardless of its characteristics but it prefers semi arid planes, grasslands, woodlands, and open forests. Red Kangaroos are the world's largest marsupials, averaging around 6ft tall, ranging between 40-200 pounds. They have a long muscular tail and muscular legs that help them hop.
It eats grass and shrubs, if it eats green plants it can go longer without having to find water in the desert., They are mature at 2 years and can live up to 23. The embryo will only develop if no joeys are in the pouch, after 33 days the newborn crawls into the pouch and stays and develops there for 8 months then the it sticks its head out of the pouch when it is ready to leave. They are active in the cool of the evening or night, and live alone or in small groups called ‘mobs’

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Habitat:  They are endemic to Australia and the Americas
Physical characteristics: External pouch (marsupim), lack placentas, sexual reproductive organs (Female- two vaginas; Male- two pronged penis), cloaka
Behavioral Characteristics: They carry their young in a pouch until they have developed enough to leave the pouch