carbon dioxide
Earth was formed somehwat less than 4.6 billion years ago. The Cambrian Era begins around 542 million years ago. Subtracting these times provides for a PreCambrian Era of around 4 billion years in length. This time period makes up around 87% of Earth's total history.
I'm going to assume you meant the Geologic Time Scale, not the Periodic Table of the Elements. In that case, the answer is the Hadean Era (which is the first in the Precambrian Eon) Although Archean Era might also be acceptable.
It was single celled, and probably something similar to an algae. Algae are eukaryotes. Cyanobacteria (blue green "algae") are actually prokaryotes. Eukaryotes have been around some 1.5 to 2 billion years.
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animal fat
Carbon dioxide
Carbon Dioxcide
Carbon Dioxide
Oxygen
autotrophic prokaryotes enriched the atmosphere with oxygen in the precambrian era :) hope this helps
life arose and the atmosphere became enriched in oxygen
Yes. The first era was the precambrian era followed by the paleozoic era then the mesozoic era than the Cenozoic era.
**Precambrian**
the Precambrian era
it was on earth the precambrian era is an era that happend several million years ago on the earths surface
85% of earths history and the earliest era that exists. bacteria mostly survived then and built up oxygen until a mass extinction.The. Era had many extinctions because of large variations in climate is what mesozoicor cenozoic or precambrian which one
Precambrian