by Julie K. Lundgren (Author)
Earth was a lot different when dinosaurs were alive. They lived alongside many ancient mammals that can no longer be found. Incredible changes on Earth have left us with fossils that scientists use to learn more about the ancestors of today's mammals.
Number of Pages: 24
Dimensions: 0.3 x 8.5 x 8.5 IN
Publication Date: January 17, 2022