.

Accordingly, what life forms existed in the Precambrian era?

Late bloomers. The fossil collection in our museum begins about 750 million years ago, near the end of Precambrian time. The only multi-cellular life forms at the end of the Precambrian were in the oceans and included some groups that have survived until the present: jellyfishes and segmented worms (annelids).

Likewise, how did the Precambrian era start? 4,600 million years ago

Also question is, how did life forms change before the end of the Precambrian eon?

Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms almost four billion years later.

What happened during the Precambrian era?

The Precambrian period refers to the earliest part of Earth's history. The earth started cooling and the outer edge of the planet solidified from molten lava to a solid crust. Water rained from the atmosphere and created oceans. The first form of life on our planet was created during the Archean eon in these oceans.