1. cálculo   philosophy   physics   astronomy   calculus   Hint Half-n-half Clue   2. álgebra   physics   zoology   trigonometry   algebra   Half-n-half Clue   3. astronomia   biology   geometry   trigonometry   astronomy   Half-n-half Clue   4. psicologia   biology   psychology   astronomy   geometry   Half-n-half Clue   5. história   geology   history   algebra   psychology   Half-n-half Clue   6. geologia   astronomy   biology   physics   geology   Half-n-half Clue   7. biologia   geography   history   biology   trigonometry   Half-n-half Clue