Les 5 questions du quiz
Question 1 : What is the chemical symbol for water?
Réponses possibles :
- O2
- CO2
- NaCl
- H2O
Explication : H2O means 2 hydrogen atoms and 1 oxygen atom.
Question 2 : What gas do we mainly breathe?
Réponses possibles :
- Nitrogen
- Helium
- Hydrogen
- Oxygen
Explication : Air contains about 78% nitrogen and 21% oxygen.
Question 3 : How many chromosomes do humans have?
Réponses possibles :
- 23
- 46
- 48



