Hard simple ques­tions facts

Selected as the most interesting among nature related questions in
Nature quiz
What is inside Swiss cheese holes?
Carbon dioxide is produced by bacteria feeding on the lactic acid. In the Middle Ages, the holes were considered a sign of imperfection and cheese makers would try to avoid them.
Correct this question
Correct this question
Very interesting!
gases facts
Globalquiz is a hard trivia game.
After playing some quizzes, you will get detailed results about your strenghts and weaknesses.
Check your knowledge
Play and see more questions
Nature quiz