The blank is surface or surface of land
Answer:
Early residents of the Indus Valley created streets and buildings using a grid pattern.
Specialization ensures that goods and services are produced by low-cost producers.
<h3>What is specialization?</h3>
It should be noted that specialization simply means the concentration of the production in a particular field.
In this case, specialization ensures that goods and services are produced by low-cost producers.
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