1. física   zoology   psychology   geography   physics   Hint Half-n-half Clue   2. trigonometría   history   geography   trigonometry   botany   Half-n-half Clue   3. biología   psychology   biology   zoology   astronomy   Half-n-half Clue   4. geología   calculus   geography   geology   zoology   Half-n-half Clue   5. geografía   geography   algebra   history   astronomy   Half-n-half Clue   6. filosofía   psychology   astronomy   philosophy   chemistry   Half-n-half Clue   7. historia   biology   history   calculus   astronomy   Half-n-half Clue