Which animal has not evolved much from its original form?

Which animal has not evolved much from its original form?
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Answer :

The National Geographic has actually answered this question in an article written by Liz Langley. It was mentioned in the article that Samantha Hopkins, an associate professor of geology at the University of Oregon, said that the two mammals that have undergone the fewest evolutionary shifts are the platypus and the opossum. Skulls of the platypus-like ancestors have been found dating back to the Cretacious period (63 million to 138 million years ago). On the other hand, a 2009 study published in the PLOS ONE journal traces the opossum lineage back to a sister group of marsupials called the peradectids, which lived at the time of dinosaur extinction in the Cretaceous-Paleogene period. You can check the entire article in this website: news.nationalgeographic.com/2015/11/151114-animals-mammals-evolution-playpus-opossum
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