Answer:
There are four main types of chromatography. These are Liquid Chromatography, Gas Chromatography, Thin-Layer Chromatography and Paper Chromatography. Liquid Chromatography is used in the world to test water samples to look for pollution in lakes and rivers.
Nice, thanks for the points.
Weaknesses include but are not limited to
-a weak central gov't
-political confusion
- differing philosophies
-communist society
-gender inequality
-social division "caste system" (but it could also be a strength in the sense that everyone knew their place"
