According to modernization theories, endogenous factors in the countries, such as traditional, illiteracy, the traditional attitude of the population, agrarian structure, the low division of labour, the lack of communication and infrastructure, etc., are answerable for underdevelopment.
Rivers<span> : flowing fresh water. </span>Wetlands<span> : tidal flows or almost none, brackish water</span>
There are no option choices so here.
Shovels, Diggers, Wells, Pipes. Hope this helps.
Those are just three numbers. They have no volume.