Biology QuizTheLastDialogueBIOLOGY QUIZTest Your Knowledge Of Biology With These QuizzesBiology Online Quiz for Kids and Adults #1. Brain is packed in the skull and perfectly stationary? True False Work Harder#2. How many neurons are there in an average human brain? One billion 100 Trillion 100 billion 1000 million Work Harder Previous FinishResultsWell Done. You Are Roaring Like A LionKeep Working. Slow & Steady Wins The Race START NEW