Why do we not have many fossil records of the Precambrian era?

The scarcity of fossil records from the Precambrian era is primarily due to the lack of hard, mineralized structures in early life forms, as many were soft-bodied organisms. Additionally, the Precambrian spans a vast time period (over 4 billion years), and geological processes such as erosion and subduction have likely destroyed or buried many potential fossils. Furthermore, the environments of the time were often not conducive to fossilization. As a result, the fossil record from this era is limited compared to later geological periods.