# ยุคอาร์ชีน
## Noun (N)
### Sense: the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
- Archean
- Archean eon
- Archean aeon
- Archeozoic
- Archaeozoic
- Archeozoic eon
- Archaeozoic aeon