What gas is exhaled by humans?

More Questions:

What former country was tennis player Martina Hingis born in?

How many points must the victor score in a game of cribbage?

The comic strip "Spy vs Spy" debuted in which year?

Author J.M. Barrie is best known for creating what fictional character?

What islands are home to most of the world's blue-footed boobies?

Belgium's name is derived from what Roman province?

What name is given to the shellfish that cling to the bottom of ships?

The Iran hostages were released in January 1981 after 444 days of captivity; what was their first stop?

Which of the continental US states was the last to be admitted to the Union?

What plan was developed by General Winfield Scott to defeat the Confederate Army?

Sun Yat-sen is considered the founding father of what country?

What country hosted the 2016 Summer Olympics?

In mathematics, which prefix refers to 10 to the power of 21?

The "Eisner Award" is named after which influential cartoonist and writer?

How old was Kevin in the 1990 film "Home Alone"?