Anybody want to help me with homework due tmrw?

Anonymous
The question is: What do you think are the main factors to keep in mind when an external material is put inside a human body and which materials do you think are suitable for this purpose?

I don’t really understand the question, and not able to ask the teacher nor can I find anything online, Does anybody know what this means?
Anybody want to help me with homework due tmrw?
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