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Your search for "breathe" returned 2,149 results
What human activities increase carbon dioxide in the atmosphere?
science.howstuffworks.com/environmental/green-science/human-activities-increase-carbon-dioxide.htm
Although a certain amount of carbon dioxide (CO2) occurs naturally in the Earth's atmosphere, there are several human activities that increase levels of the greenhouse gas.
How Did the U.S. Look Before the EPA?
people.howstuffworks.com/what-did-country-look-epa.htm
The U.S. has come a long way since forming the EPA in 1970. HowStuffWorks digs out some pics from the National Archives to show just how far.
All Mouth, No Anus: Microscopic Organism Could Be Oldest Human Ancestor
animals.howstuffworks.com/marine-life/saccorhytus-coronarius-deuterostome-ancestor.htm
Primitive deuterostome fossils show a precursor to all vertebrates, including humans. Learn about deuterostomes in this HowStuffWorks Now article.
Fart-tastic Facts Quiz
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Do you have what it takes to earn ultimate stink-out points? Take this fart facts quiz and find out!
What Is Your Soul Element?
play.howstuffworks.com/quiz/what-is-your-soul-element
Everyone has a soul, and every soul has an element that keeps you connected to the universe. Which of the four elements does your soul use to make it through life? Find out!
Can We Guess Your Ideal Man Based on These 30 Questions?
play.howstuffworks.com/quiz/we-know-your-ideal-man-based-these-30-questions
Finding an ideal mate can be difficult. This is because there is a limited supply of men and a perfect man is a narrow band. Can we guess your ideal man?
Which Elite Military Unit Do You Belong In?
play.howstuffworks.com/quiz/which-elite-military-unit-do-you-belong
It's a given that you're someone who is in excellent physical condition and is incredibly brave. With that established, let's see which group would utilize your particular talents the best.
Choose Some Spirit Animals and We'll Guess Your Magical Power
play.howstuffworks.com/quiz/choose-some-spirit-animals-well-tell-you-your-magical-power
Spirit animals are meant to show us the way in life. So, let your taste in guardians tell us which magical ability you should be blessed with.
Can We Guess if You Live in the North or South Based on How You Speak?
play.howstuffworks.com/quiz/can-we-guess-if-you-live-in-the-north-or-south-based-on-how-you-speak
Where do you park your car? Is it a "g'rah-ge" or is it a "gare-ah-ge?" Pick the words and phrases you use every day during this quiz, and we'll know if you live in the North or the South. Will we get it right?
What Would Your Job in the Marines Be?
play.howstuffworks.com/quiz/what-would-your-job-the-marines-be
The United States Marine Corps is a major part of the Navy which has a reputation for only admitting the elite. That being said, if you were accepted, what job would you have?