unicellular organisms are earliest forms of life
The first organisms on Earth were likely simple single-celled prokaryotes, such as bacteria and archaea, that appeared around 3.5 billion years ago. These early organisms were anaerobic, meaning they did not require oxygen to survive. These primitive life forms eventually evolved into more complex organisms over millions of years.
An isostatic is something that pertains to or is characterized by isostasy. Isostasy is the equilibrium of the Earths crust.
What are two ways that's scientists can study earths climates history
epoch
Nitrogen
In sedimentary rock.
Historical geology.
History can not be measured it can only be recorded, studied or experienced.
precambrian era
to die
because
Astronomy This is the study of the earth and physical structure and history