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