Which element has the chemical symbol ‘O’?

Who painted the Mona Lisa?

What is the smallest planet in our solar system?

Who discovered gravity when he saw an apple fall from a tree?

Which gas do plants absorb from the atmosphere?

How many bones are there in the adult human body?

In which year did World War II end?

What is the smallest country in the world?

How many continents are there on Earth?

What is the largest mammal in the world?