1. geografía   physics   chemistry   geography   botany   Hint Half-n-half Clue   2. química   philosophy   chemistry   trigonometry   botany   Half-n-half Clue   3. geología   astronomy   physics   geology   algebra   Half-n-half Clue   4. trigonometría   psychology   trigonometry   geometry   chemistry   Half-n-half Clue   5. zoología   botany   calculus   chemistry   zoology   Half-n-half Clue   6. filosofía   psychology   philosophy   physics   botany   Half-n-half Clue   7. geometría   geology   geometry   biology   zoology   Half-n-half Clue