Oxygen
Carbon Dioxide
Nitrogen
Hydrogen
Argon
Correct answer is C
Nitrogen makes up approximately 78% of the Earth's atmosphere.
What is the primary language spoken in Cyprus?...
How do you pin a tweet to your profile?...
What is the primary function of white blood cells?...
What is the capital of Armenia?...
Which disease is caused by the human papillomavirus (HPV)?...
Which desert is known as the "Empty Quarter"?...
What is the capital of Greece?...
What is the birthday of Benjamin Franklin?...