Why were Indigenous people so vulnerable to European and African diseases?Check all of the boxes that apply.

Indigenous populations in the Americas had been separated from Europe, Africa, and Asia for centuries, so they had little or no prior exposure to many diseases brought across the Atlantic. Without that exposure, they generally lacked population-level immunity and natural defenses against those illnesses. There is no basis for saying Europeans had devised a plan to infect Indigenous people before sailing, so C does not apply.

AI-written and checked against the verified answer.