How Fish Fins Evolved Into Mammal Limbs: The Genes Were There, They Just Had To Be 'Clicked'

Scientists have long believed life on Earth emerged from the oceans hundreds of millions of years ago when our aquatic ancestors evolved to live on dry land. But how did fish develop limbs in the first place? It's a question that has perplexed scientists for decades, but a new study is elucidating the enduring mystery of how life on Earth found its legs.