ChatGPT said:
Here’s a simplified timeline diagram of the evolution of life on Earth, highlighting major milestones:
sqlCopyEdit| Time (in billions/millions of years ago) | Key Evolutionary Milestones |
|------------------------------------------|-------------------------------------------|
| ~4.5 bya | Earth forms |
| ~4.0 bya | First oceans form |
| ~3.8 bya | First life (prokaryotic cells) |
| ~2.5 bya | Photosynthesis evolves (oxygen produced) |
| ~1.8 bya | First eukaryotic cells |
| ~1.2 bya | First multicellular life |
| ~600 mya | Simple animals (sponges, jellyfish) |
| ~541 mya | Cambrian Explosion: many animal phyla |
| ~500 mya | First vertebrates (jawless fish) |
| ~400 mya | First land plants and insects |
| ~360 mya | Amphibians evolve from fish |
| ~300 mya | Reptiles evolve |
| ~230 mya | Dinosaurs appear |
| ~200 mya | Mammals appear |
| ~150 mya | Birds evolve from dinosaurs |
| ~65 mya | Mass extinction (dinosaurs go extinct) |
| ~55 mya | Primates evolve |
| ~7 mya | First hominins (human ancestors) |
| ~2.5 mya | Genus *Homo* evolves |
| ~300,000 ya | *Homo sapiens* appears |
| ~10,000 ya | Agriculture begins |