Final answer:
The Phanerozoic Eon has more divisions due to the emergence of complex life forms, contrasting with the simpler organisms of the Archean Eon.
Explanation:
The Phanerozoic Eon has many more divisions associated with it than the Archean Eon because...
- The Phanerozoic Eon is the time period most familiar to us as it contains rocks with evidence of life forms we recognize.
- It represents a smaller portion of Earth's history but a time when more complex life forms emerged, leading to more detailed subdivisions like eras, periods, epochs, and ages.
- On the other hand, the Archean Eon had mainly simple single-celled organisms, resulting in fewer divisions needed to capture its characteristics.
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