| Answer | Crossword Clue |
|---|---|
| SETIN | Became widespread |
| IRONAGE | When alphabetic writing became widespread |
| IRONAGE | Era in which alphabetic writing became widespread |
| MIOCENE | Epoch in which grazing mammals became widespread |
| norms | widespread or usual practice, procedure, or custom standing ovations became the norm |
| norm | widespread or usual practice, procedure, or custom standing ovations became the norm |
| miocene | noting or pertaining to an epoch of the Tertiary Period, occurring from 25 to 10 million years ago, when grazing mammals became widespread |
