Give an account of the geological time scale citing the biological features.

The geological time scale (GTS) is a chronological framework used to understand Earth’s history, spanning approximately 4.6 billion years. It is divided into eons, eras, periods, epochs, and ages based on major geological and biological events. The GTS reflects the evolutionary progression of life and significant environmental changes.

1. Precambrian (4.6 Ga–541 Ma):
This eon includes the Hadean, Archean, and ______ __________ _________ __________ ______ ___.
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