Did you know that the first horses were no bigger than rabbits? Discover how living things evolve or change over time to become more suited to their environment. Explore the fascinating world of living things, including the processes that keep animals and plants alive, and how people study them. Fact boxes that introduce the most amazing plants and animals are featured in this book along with colorful photographs that show the incredible diversity of life. This book includes a glossary and resources for further research.