Compare the natural conditions and occupations of the inhabitants of Ancient India, China, Persia

Compare the natural conditions and occupations of the inhabitants of Ancient India, China, Persia, is there anything in common between them?

Natural conditions of ancient China:

Temperate climate;
Two rivers, the Yellow River and the Yangtze, flow on the territory of the country;
Lands of average fertility;
The lands are hilly and flat.

Natural conditions of India:

Warm and hot climate;
The Indus and Ganges rivers flow on the territory of the country;
Fertile land;
The territories are flat with dense jungle.

Natural conditions of Persia:

Warm and dry climate;
On the territory of the country there are small and rare rivers;
The terrain is hilly and mountainous;
Lands of low and medium fertility, rare forests.