1. historia   botany   biology   history   physics   Hint Half-n-half Clue   2. zoología   zoology   botany   biology   calculus   Half-n-half Clue   3. filosofía   trigonometry   philosophy   physics   chemistry   Half-n-half Clue   4. física   biology   geography   algebra   physics   Half-n-half Clue   5. cálculo   calculus   geometry   geology   philosophy   Half-n-half Clue   6. química   astronomy   chemistry   history   philosophy   Half-n-half Clue   7. psicología   astronomy   botany   calculus   psychology   Half-n-half Clue