Classification of Life, 2nd EditionTwenty-First Century Books, 1 янв. 2013 г. - Всего страниц: 78 How are polar bears related to pandas? For thousands of years, philosophers and scientists have tried to organize and understand, or classify, the relationships among Earth's animals and plants. Early classification systems were cumbersome and inconsistent. In the late 1720s, Carl Linnaeus began developing a classification system to describe relationships among all living things, including animals, plants, fungi, and bacteria. This organization, called the tree of life, is still the basis of the classification system used by scientists today. |
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... body structure and behavior. If scientists can get a tissue sample, they look at the organism's DNA (deoxyribonucleic acid) too. DNA is a molecule that contains all the instructions a cell needs to carry out the activities that maintain ...
... body structures closely. He also considered its behavior. He knew where it lived, what it ate, and how it repro- duced. Once he understood a creature well, he compared it to other animals he'd studied. Before deciding how to classify ...
... body structure is very different from most other animals.” Descriptions such as this fill the pages of On the Parts of Animals and History of Animals, two of Aristotle's great works. Historians think Aristotle wrote about plants too ...
... body features. When grouping mammals, reptiles, fish, and insects, Ray considered both the form and the function of various body ... structures. 14 Classification of Life.
... body structures and behaviors. They also study the molecules in its cells. To classify bacteria and other tiny organisms, researchers study the organisms' DNA and other molecules. Because appearance plays a smaller role in modern ...
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9 | |
17 | |
Classification Meets Evolution | 26 |
Adding New Kingdoms | 34 |
The Birth Of Cladistics | 40 |
Kingdoms Or Domains? | 49 |
Glossary | 62 |
Biographies | 66 |
Source Notes | 71 |
Selected Bibliography | 72 |
Further ReadingWebsites | 74 |
Index | 76 |
Photo Acknowledgments | 78 |
Back Cover | 80 |
Timeline | 64 |