| Question |
Answer |
| 4.5 billion years agoliving things were one-celled organisms |
Precambrian Era |
| 600 million years agofossile recrods of hard-shell animals |
Cambrian Period (Paleozoic Era) |
| 510 million years agoanimal life in the oceans |
Ordovician Period (Paleozoic Era) |
| 439 million years agofirst land plants evolve, reefs build up |
Silurian Period (Paleozoic Era) |
| 408 million years agoland plants and amphibians evolve |
Devonian Period (Paleozoic Era) |
| 360 million years agoamphibians and reptiles evolve |
Carboniferous Period (Paleozoic Era) |
| 290 million years agocone-bearing plants and reptiles evolve |
Permian Period (Paleozoic Era) |
| 245 million years agomammals present |
Triassic Period (Mesozoic Era) |
| 208 million years agodinosaurs present |
Jurassic Period (Mesozoic Era) |
| 144 million years agomore different dinosaurs appear than during Jurassic Period |
Cretaceous Period (Mesozoic Era) |
| 65 million years agoapes and humanoids |
Tertiary Period (Cenozoic Era) |
| 1.6 million years ago to TODAY!humans |
Quaternary Period (Cenozoic Era) |
MedTemCP5 Word+Pics
