| A | B |
|---|
| evolution | the change in species over time |
| example of a vertebrate | fish |
| size of first horses | size of today's foxes |
| size of first elephants | size of today's pigs |
| extinction | occurs when a species does not have the traits needed to survive |
| scientist who developed the classification system we use today | Carolus Linnaeus |
| first vertebrates to live on land | amphibians |
| first vertebrates to live on earth | fish |
| scientists now think dinosaurs were most like | birds |
| Jack Horner was looking for these | baby dinosaur fossils |
| Dinosaurs became extinct | 65 million years ago |
| taxonomy | science of classifying organisms |
| paleontologist | people who study fossils |
| what the geologic time scale shows | evolution |
| Developed the survival of the fittest theory | Charles Darwin |
| longest era | Precambrian |
| humans live in this era | Cenozoic |
| age of mammals | Cenozoic |
| earliest birds appeared in this era | Mesozoic |
| age of reptiles | Mesozoic |
| bacteria dominated in this era | Precambrian |
| first and oldest era | Precambrian |
| second era | Paleozoic |
| third era | Mesozoic |
| Last and most recent era | Cenozoic |
| the official scientific name of our species | Homo sapiens |
| one of the five kingdoms | animals |
| one of the five kingdoms | plants |
| one of the five kingdoms | monerans |
| one of the five kingdoms | protists |
| one of the five kingdoms | fungi |
| meteorite theory | theory that a meteorite hit the earth, blocked sun, killed plants and then animals |
| flowering plants theory | theory that new flowering plants poisoned the dinosaurs |
