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Questionnaries  are primary source. Case studies are primary source. Interviews are primary source. Government reports are primary source.  Previous research are secondary source. Web article are secondary source . Observations are primary source.

Explanation: Primary sources are the original documents of an event .A secondary source is generally one or more steps removed from the event or time period .

answer; environmental science;

answer; bona fide occupational qualification; (bfoq);