https://www.popsci.com/environment/first-mammal-ancestor/
Unlocking the mysteries of the first mammals | Popular Science
The genome of the earliest known mammal ancestor has been reconstructed by an international team of researchers.
the mysteriesfirst mammalsunlockingpopularscience
https://www.sciencetimes.com/articles/27672/20201012/200-million-year-old-first-mammals-lived-reptiles.htm
200-Million-Year-Old Teeth Suggest First Mammals Lived Like Reptiles
Oct 12, 2020 - A research team of European scientists analyzed 200 million-year-old teeth that belonged to some of the earliest mammals, suggesting that these animals lived...
200 millionyear oldfirst mammalsteeth