Stem mammaliaforms (also known as 'stem mammals') are long-extinct relatives to the extant mammals (crown Mammalia). Docodonts are such a lineage of stem mammaliaforms. Their morphologies provide ...

Explore the fascinating process of python digestion and how these reptiles regenerate their intestines after every meal.

But after our adult teeth grow in, the stem cells die and disappear. To understand why, let's take a journey back in time. To about 320 million years ago, when mammals and reptiles split off.