Final answer:
The cities of Harappa and Mohenjo-Daro in the Indus Valley Civilization were sophisticated due to advanced agricultural techniques, well-planned urban infrastructure, and extensive use of written language.
Step-by-step explanation:
The cities of Harappa and Mohenjo-Daro in the Indus Valley Civilization were sophisticated due to several factors:
- Advanced agricultural techniques: The farmers in Harappa and Mohenjo-Daro cultivated domesticated crops and used draft animals for farming, which allowed for efficient agriculture.
- Well-planned urban infrastructure: The cities had advanced drainage systems, orderly streets, and distinctive bricks made in ovens, indicating a high level of urban planning.
- Extensive use of written language: Although the Indus script has yet to be deciphered, the presence of a complex writing system suggests a high level of literacy and communication in the civilization.