As life on earth evolved, billions of creatures made the move from primordial ooze to life on land. For most, that eons-long transformation was a one-way trip. With the exception of amphibians—which ...
A visualization of Tiktaalik roseae, an extinct aquatic animal with fossils that shed light on the evolution of land animals from marine animals millions of years ago. Nobu Tamura via Wikimedia ...
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