Tag Archives: fossil

250-Million-Year-Old Fossil Confirms Mammalian Ancestors Laid Eggs

A recent study published in the journal PLOS One has presented compelling evidence, derived from a 250-million-year-old fossil, that the ancient ancestors of mammals, known as synapsids, were indeed egg-layers. This groundbreaking discovery centers on the meticulously analyzed embryo of a Lystrosaurus, a resilient "mammal-like reptile" that famously survived the most cataclysmic mass extinction event in Earth’s history approximately 252 …

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