A new study challenges the idea that marsupials are more 'primitive' than mammals by showing their development has changed more than mammals since they last shared an ancestor.
"For a long time, people have treated marsupials as 'lesser mammals,' which represent the intermediate stage between placental mammals and egg-layers,""It turns out that marsupials are the ones that are far more evolved from the ancestral form."
"As a member of the placental mammals, we often have this bias that ours is the group that evolution is directed towards, but that's not how evolution works,"Evolution is often misrepresented as a straightforward road to greater complexity, where species with more ancient traits are thought to be simpler or 'primitive'.demonstrate that complexity can be repeatedly gained and lost during a species's evolutionary journey.
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