Ferns
Precambrian
Jellyfish intervirbrates
Precambrian
Precambrian would have been dominant because there were so many of them. They lived in very large groups in that were known as stromatolites which were reef like in many ways.
Precambrian
Seaweeds were not present in the Precambrian, The first plants were simple single celled algae or colonial varieties which formed stromatolites. There were no land plants.
No plants existed during the Precambrian. The formation of coal beds relied on vegetation.
There were no land plants or forests yet.
yes
Yes, although the fossil record for the precambrian period is scarce. See related link.
Most deserts have different plants but the most dominant would be the grasses.
Some plants are bacteria, green blue red algae, acritarches, angiosperms and conifers