Final answer:
Cossack migration into Siberia led to the formation of new social hierarchies, disrupted indigenous social structures, and introduced Russian governance and culture. This migration had a significant impact on the social and economic aspects of Siberian society.
Step-by-step explanation:
In what ways did Cossack migration into Siberia change existing social structures? The correct answer is B. It led to the formation of new social hierarchies. The Cossack expansion into Siberia was part of the larger Russian colonization efforts, which began in the late 16th century. As the Cossacks moved into Siberia, they disrupted the pre-existing social structures of indigenous peoples.
They established new military-administrative units called voiskos, which served as centers of Russian authority and governance in the region. The Cossacks, operating under the auspices of the Russian state, demanded tribute from native Siberian tribes, which shifted social dynamics and introduced a new hierarchical system.