What role did pastoral nomads play in overland trading exchanges​

Pastoral nomads formed communities. They moved from place to place and lived primarily from their domesticated animals like cattle, sheep, camels, or horses. They also played an important role in the exchanges along the Silk Road. ... Travelers depended on these nomads when they crossed the dangerous Silk Roads.

Explanation:

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whose power in the senate is equal to the power of the speaker of the house?

i think it was   tsar alexander ii