Diseases spread through American Indian communities is the statement best completes the diagram Cause Europeans arrive in the 1600s Effect. Hence, option C is correct.
What is Diseases?
Diseases is the harmful deviation that cause some kind of infection to the person's body. There are different types of diseases that can cause to the person. Generally the disease can be cured by the medicine and different types of drugs, but some of the diseases are incurable.
Thus, option C is correct.
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