Discoveries in Life Science that Changed the World The planet Earth has more than 8 million species of complex life, and perhaps millions more of simpler bugs and germs. Life science studies these living things and investigates where life forms came from and they survive. This book examines fifteen of the most essential discoveries in the history of the study of life science, including the implications resulting from of each finding. Readers will learn about early discoveries, such as the invention of the microscope, the discovery of photosynthesis, and development of the concept of natural selection, along with more recent revelations, such as the structure of DNA and cloning of Dolly the Sheep.