Answer
The Precambrian accounts for nearly 90 percent of geologic time and has fewer divisions than the rest of the time scale because it represents an exceedingly long span of Earth's history that lacks well-defined and easily distinguishable geological events. During much of the Precambrian, Earth was dominated by simple life forms, and significant geological events, like the emergence of complex multicellular life and the formation of major mountain ranges, occurred later in the Phanerozoic eon. The lack of distinct events and the scarcity of well-preserved rocks from this ancient period make it challenging to subdivide the Precambrian into more detailed intervals.
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