| occur at same time | 0.62 |
| sweep across continent | 0.39 |
| wipe out dinosaur | 0.33 |
| occur near the pleistoc… | 0.33 |
| point out further retre… | 0.28 |
| introduce cryochamber | 0.25 |
| occur in australia | 0.25 |
| could occur | 0.25 |
| happened over year | 0.25 |
| gone extinct | 0.16 |
| protein synthesis | 0.30 |
| inevitable | 0.56 |
| bad | 0.50 |
| gradual | 0.43 |
| common | 0.41 |
| devastating | 0.39 |
| irreversible | 0.37 |
| rapid | 0.33 |
| normal | 0.30 |
| good | 0.27 |
| sudden | 0.25 |
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| natural process | 0.49 |
| event | 0.36 |
| the termination of an o… | 0.25 |
| macroevolution | 0.25 |
| caused by cat | 0.58 |
| driven by habitat loss | 0.52 |
| caused by climate change | 0.46 |
| avoided | 0.39 |
| caused by massive aster… | 0.39 |
| attributed to pollution | 0.34 |
| exacerbated by volcanic… | 0.33 |
| proclaimed | 0.28 |
| caused by impact | 0.25 |
| caused by comet | 0.25 |
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