Why are so many big cities located along the banks of a river?

Explanation:

Maritime trade or water transport is the cheapest and safest mode of transport and hence it eases trade between two points ensuring the goods remain affordable to the end consumers.

Besides, proximity to water source ensures that the residents of the cities access clean water at reduced costs.

there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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