1. filosofía   geometry   geography   geology   philosophy   Hint Half-n-half Clue   2. historia   zoology   physics   history   psychology   Half-n-half Clue   3. química   chemistry   geology   algebra   trigonometry   Half-n-half Clue   4. trigonometría   geometry   trigonometry   calculus   geology   Half-n-half Clue   5. geología   geometry   zoology   geology   calculus   Half-n-half Clue   6. botánica   botany   chemistry   calculus   psychology   Half-n-half Clue   7. astronomía   geometry   geology   zoology   astronomy   Half-n-half Clue