1. physique   philosophy   physics   biology   geology   Hint Half-n-half Clue   2. algèbre   geology   history   algebra   chemistry   Half-n-half Clue   3. botanique   physics   botany   geology   history   Half-n-half Clue   4. zoologie   trigonometry   chemistry   astronomy   zoology   Half-n-half Clue   5. psychologie   psychology   botany   zoology   physics   Half-n-half Clue   6. chimie   algebra   trigonometry   astronomy   chemistry   Half-n-half Clue   7. géologie   astronomy   geology   philosophy   geography   Half-n-half Clue