1. calcu   trigonometry   astronomy   algebra   calculus   Hint Half-n-half Clue   2. astronomie   astronomy   geography   history   trigonometry   Half-n-half Clue   3. biologie   geometry   biology   geography   psychology   Half-n-half Clue   4. physique   physics   geography   history   biology   Half-n-half Clue   5. géologie   biology   geology   physics   zoology   Half-n-half Clue   6. botanique   botany   psychology   chemistry   geology   Half-n-half Clue   7. algèbre   geometry   history   botany   algebra   Half-n-half Clue