The main difference is that there is not a significant reservoir of phosphorous in the atmosphere, while both nitrogen and carbon are found in large amounts in the atmosphere.
Answer:
The main difference is that you would not live the same life in a low-income country as you would live in a higher income country.
For example lets take India and US
Most of the people in India would not able to afford an Audi but the people in the US would be able to afford one as it is cheaper and also have less taxes
Samples should be gathered as soon as possible before any contamination of evidence.
