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it is one of these

Explanation:

These large concentrations of people are referred to as complex societies or civilizations, which share many features, including having a dense population, an agriculture-based economy, a social hierarchy, a division of labor and specialization, a centralized government, monuments, record-keeping and writing

All Of The Above

Explanation:

Think of the human civilization as of today to help you! We have the arts, religions, a writing system ( many in terms of languages ), classes (lower, middle, higher in terms of wealth) cities and governments around the globe. This could also be seen in Rome and various other places in the pre technological advanced eras.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.