1. história   history   zoology   trigonometry   calculus   Hint Half-n-half Clue   2. física   astronomy   geology   physics   history   Half-n-half Clue   3. cálculo   history   trigonometry   calculus   zoology   Half-n-half Clue   4. geografia   botany   trigonometry   geography   astronomy   Half-n-half Clue   5. trigonometria   biology   chemistry   geometry   trigonometry   Half-n-half Clue   6. zoologia   algebra   physics   zoology   geology   Half-n-half Clue   7. química   chemistry   geometry   astronomy   algebra   Half-n-half Clue