<span>Scientists choose where are units of time began and ended based on major changes in life forms at certain times</span>
Answer: light energy
Explanation: Hope this helps!
<span>The populations are already sparse (due to being mainly desert) added to the fact that there is a huge influx of people seeking work oppotunities in the oil industry, from Westerners to Asian communities. This swamps the local population. </span>
What region are u referring to?
A-through an optimistic viewpoint.
