Chapter 1. The Study of Life Introduction Viewed from space, Earth offers no clues about the diversity of life forms that reside there. Scientists believe that the first forms of life on Earth were microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 250 million years ago. The earliest representatives of the genus Homo, to which we belong, have inhabited t
| Category | science |
|---|---|
| Subject | Biology, life sciences |
| Year | 2023 |
| Authors | |
| Chapters | 102 |
| Word Count | |
| Price | |
| Institution | St. Francis Xavier University |
| License | Creative Commons - Attribution - https://creativecommons.org/licenses/by/4.0/ |