Occurrence of cancer was identified between april 1991 and july 2002 for 50,000 troops who served in the first gulf war (ended april 1991) and 50,000 troops who served elsewhere during the same period. (a) observational cohort(b) observational cross-sectional(c) observational case-control(d) experimental

Lina went in camping woods. while camping, she accidentally touched a strange planet. her hand immediately started itching, and her skin erupted in hives. after she gets home, her grandmother cooked some oatmeal, wrapped it in a cloth, and put it on lina affected hand. lina’s grandmother followed a traditional what remedy.