The beginning of the Precambrian era is marked by the appearance of the first life forms with hard parts.

Name: The beginning of the Precambrian era is marked by the appearance of the first life forms with hard parts.
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The beginning of the Precambrian era is not marked by the appearance of the first life forms with hard parts. In fact, much of the Precambrian was characterized by single-celled organisms and simple multicellular organisms without hard parts.

The Beginning of the Precambrian Era Is Marked by the Appearance