Thanks, Fish, For The Genetic Blueprints Of Limbs

How did we get limbs from ancestral fish fins? It's a fascinating topic, a science enigma. Our first four-legged land ancestor came out of the sea about 350 million years ago. Watching a lungfish, our closest living fish relative, crawl on its four pointed fins gives us an idea of what the first evolutionary steps on land may have looked like. However, the transitional path between fin structural elements in fish and limbs in tetrapods remains elusive.  read more

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