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Found in Australia. They live in many different habitats regardless if its grassland, woodland, or savannas. They travel in groups called mobs which is dominated by one male.
Females become fertile between 15 and 20 months while it takes the men 2 years. Kangaroos can give birth to only one baby (called a joey) at a time. The time the joey stays in the mothers pouch is different depending on the type of kangaroo. If it's a red kangaroo it stays in the mothers pouch for about 8 months but if it's a grey kangaroo it stays in the pouch for 1 year.
The kangaroo has a very long muscular tail. They primarily hop because their feet makes it difficult for them to walk like humans. The weight can range anywhere from 40 pounds to 200. They are a reddish-brown color or a red-grey.

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Primarily found in east & south Australia. They live in trees primarily in forests and woodlands.
Koala mating usually occurs between December and March. They are typically able to reproduce around 2-3 years old. They make calls to each other to set the mood. Since Koalas usually sleep 20+ hours a day mating doesn't take long because of how much energy it uses. They only stay in the mothers pouch for about 6 months, but females leave for good after one year.
Koalas have strong limbs to make it easier to climb trees. There fingers are called digits. While all paws have 5 digits on the back paw two digits are formed together with no claws. The front paw has two digits that are basically opposable thumbs that make it easier to climb trees. They can be either brown or grey in color with white patches.

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Quokka's live only in southwest Australia and on two islands, Rottnest Island and Bald Island. They like shrub land and warm weather.
Mating season on mainland lasts year round but on the islands takes place during January-August. They can reproduce around 18 months and have 1-2 children per year.
Quokka hop around. They are a very small animal with a very round body. They can be either brown or grey in color.

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1) Stabilizing selection
2) Decent with modification
Event that supports
1) Geographic isolation
2) Change in environment

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Tracking Marsupial Evolution Using Archaic Genomic Retroposon Insertions

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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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The Tree-Kangaroo and Mammal Group :: Tree-kangaroo overview

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Further down the taxonomic level, tree-kangaroos, being proper macro-(big) -pods(foot), i.e. kangaroos, are therefore placed in the family Macropodidae. Therein the latin term for the tree-kangaroo genus is Dendrolagus, meaning tree-(dendro) -hare(lagus). In tandem with the genus name the scientific species name in the Lumholtz's case is: Dendrolagus lumholtzi.

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All though there is variation of number of chromosomes they have many similarities. Chromosome 5 & 6 are smaller than the other chromosomes. There's heterochromatinon on al autosomes & sex chromosomes.

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All organisms in this family have mammary glands, three middle ear bones, a front pouch, and they're herbivores

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http://www.australia.gov.au/about-australia/australian-story/australias-fossil-past
This is fossils of a Pleistocene wallaby, Protemnodon. During the Pleistocene epoch era.

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http://theconversation.com/fossils-reveal-australias-tree-top-heavyweight-herbivore-10888
The name of this fossil is Nimbadon which is 15 million years old

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https://www.wired.com/2009/05/extreme-mammal-hall-of-fame/
The name of this fossil is Sarcophilus harrisii and it is 3.6 million years old.

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http://www.paleocene-mammals.de/marsupials.htm
It's name is Pucadelphys andinus and it is 30 million years old

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https://www.pinterest.com/pin/289989663488486358/
It's name is Dasyurops maculatus and it is 1.8 million years old.

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http://cms.ausgeo.bauer-media.net.au/news/2010/07/fossils-reveal-prehistoric-life-cycle
This is 15 million years and it is named Vombatidae.

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The fossils show evolution because it shows how they all use to be larger with thinker bones. That made it hard for them to climb trees or to hide from predators so they shrank in size.

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Both show similarities by ears and paws. Once the baby is born at a very early age it will go into the mothers pouch to grow and be able to live on it's own.
https://embryology.med.unsw.edu.au/embryology/index.php/Koala_Development https://www.google.com/search?q=kangaroo+embryo&safe=strict&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjCwtSblJrUAhWE3SYKHV-CA0sQ_AUICigB&biw=1366&bih=662#imgrc=j7xOVcMVg2yAkM:

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One adaptation in this whole group is the feet bones for the Koala. On it's back paw two digits are formed together to make it easier to climb trees. This adaptation helped the animal to be able to function better since they eat leaves and live in trees.

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https://www.savethekoala.com/about-koalas/physical-characteristics-koala
https://australianmuseum.net.au/quokka
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC320943/

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1) Characteristics are they're multicellular, eukaryotic, and are heterotrophs.
3) It shows all the similar characteristics which shows that even if they're a different size or species they have similar underlining qualities.