comparing
Marsupials are like amphibians since marsupials use cutaneous gas exchange in their early stages of life much like amphibians.
Marsupials are also like birds in the way that they both have four chambered hearts.
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Contrasting
Marsupials are different from fish as fishes externally fertilize and marsupials internally fertilize.
Marsupials are different from birds in the digestive system area. Birds have a crop in the esophagus for temporary food storage. The crop also softens food before it enter the stomach.
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