The sentences given below, when properly sequenced, form a coherent paragraph.Each sentence is labelled with a number. Decide on the most logical order and enterthe sequence of numbers in the space provided.
1. Among its major urban centres, Harappa and Mohenjo-Daro stand out as primeexamples of this architectural prowess, revealing large public structures,residential areas, and sophisticated water management systems indicative of acomplex societal structure.

2. Showing remarkable sophistication for its time, this ancient culture developedmeticulously planned cities, complete with advanced sanitation systems andintricate grid layouts that underscore its profound understanding of urban designand engineering.

3. Economically, the civilization thrived on a foundation of extensive tradenetworks, connecting them with distant lands, alongside a robust agriculturalsystem that sustained its large populations and facilitated surplus production.

4. Despite its impressive achievements and longevity, the reasons behind theeventual decline of this remarkable civilization remain largely enigmatic,prompting ongoing research and speculation among historians andarchaeologists.

5. The Indus Valley Civilization, flourishing in the Bronze Age, represents one ofhumanity's earliest urban societies, evidenced by archaeological discoveriesdating back thousands of years.