1. química   history   botany   chemistry   trigonometry   Hint Half-n-half Clue   2. psicología   zoology   geometry   psychology   geology   Half-n-half Clue   3. álgebra   algebra   physics   trigonometry   astronomy   Half-n-half Clue   4. astronomía   geometry   geology   astronomy   psychology   Half-n-half Clue   5. geometría   trigonometry   geometry   psychology   philosophy   Half-n-half Clue   6. geografía   geography   geology   physics   chemistry   Half-n-half Clue   7. trigonometría   physics   geology   psychology   trigonometry   Half-n-half Clue