What were some of the major inventions or developments of the Indus River Valley Civilizations? Two sentences

Answer 1

Some of the major inventions or developments of the Indus River Valley Civilizations include an advanced urban planning system with well-designed streets and drainage systems, as well as the use of standardized weights and measures for trade and commerce. Additionally, they had a sophisticated system of writing, known as the Indus script, although its meaning is still not fully understood.