Land, soil, water, natural sources are placed differently all over the world some place are easy to inhabit others aren't
According to the geological time span, the era which covers major history of the Earth is considered to be Precambrian era.
Answer: Option 3
<u>Explanation:</u>
Precambrian era is considered to be the most covering history of the Earth based on two factors, one is that it is longest era according to the geological time scale.
And as it is the longest era, major historical events of Earth are witnessed during this time. Precambrian era is known to be the beginning of formation of Earth which was about 4.5 billion years ago and it lasted for 542 million years ago.
If they have an opportunity in the other country (work etc.).
The first one is wrong because they were still in disarray and revolution at the time being. They couldn't quite do this at the time due to those two problems.
The force exerted by the atmosphere at a given point