1. cálculo   philosophy   calculus   geology   history   Hint Half-n-half Clue   2. zoología   zoology   geology   physics   chemistry   Half-n-half Clue   3. trigonometría   history   astronomy   trigonometry   philosophy   Half-n-half Clue   4. química   chemistry   psychology   trigonometry   geometry   Half-n-half Clue   5. botánica   geometry   chemistry   botany   psychology   Half-n-half Clue   6. geometría   chemistry   geology   botany   geometry   Half-n-half Clue   7. álgebra   trigonometry   history   algebra   philosophy   Half-n-half Clue