The threat of history refers to . some subjects who have had history classes and others who have not the realization that some subjects are much older than others events external to the experiment that will impact the results the fact that only current, relevant subjects need be studied

 External event can impact research through being present outside

Explanation:

According to question, threat of history is the factor that can impact outcome of the research in damaging manner.External event and factors taking place outside the historical research can influence result and modify it through manipulation of involved inputs and techniques.

Other options are incorrect because subject being older than other subject, studying of only current subject ,some subject are history related and some without realization do not create threat of history.

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.

glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).