According to Live Science, newly analyzed three-hundred-million-year-old fossils discovered near Chicago are reshaping our understanding of vertebrate evolution. For decades, scientists have assumed that the first four-legged creatures to walk on land—our ancient ancestors—lived like amphibians, dividing their lives between water and solid ground. But detailed examination of rare fossil specimens suggests the actual story was quite different. These early tetrapods appear to have developed fully terrestrial life cycles, transitioning directly to land-adapted forms rather than passing through aquatic stages. The findings challenge a longstanding assumption in evolutionary biology about how the conquest of dry land actually unfolded.

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