There's been a long-standing debate about whether or not the key features that define placental mammals like ourselves emerged in our ancestors before or after the extinction event that wiped out the dinosaurs.
that suggests the lineage stretches further back in time, alongside the dinosaurs.
"We pulled together thousands of fossils of placental mammals and were able to see the patterns of origination and extinction of the different groups,""Based on this, we could estimate when placental mammals evolved."hit that more modern lineages of placental mammals started to emerge. It's therefore possible that the conditions were better for diversification after the dinosaurs went extinct.
This included the groups that gave rise to primates, dogs and cats, rabbits and hares. What's more, the simulations matched up well with"The model we used estimates origination ages based on when lineages first appear in the fossil record and the pattern of species diversity through time for the lineage,"
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