What was the world like before humans? Prehistoric Life takes readers on a journey through time to uncover the ancient creatures and ecosystems that once ruled the earth. Through engaging articles from Scientific American, this book reveals how scientists use fossils, DNA, and cutting-edge technology to piece together the lives of dinosaurs, early mammals, and even stranger forms of life from Earth's distant past. Perfect for curious teens, this collection shows how prehistoric discoveries continue to shape our understanding of evolution, extinction, and the origins of life itself.