Which of the following statements about Earth’s atmosphere is true? ( i picked Earth’s atmosphere contains 78 percent water vapor, which is essential to life. )

Question

anonymous · Answer

A. Earth’s atmosphere contains 78 percent water vapor, which is essential to life.
B. Earth’s atmosphere contains 21 percent oxygen.
C. Earth’s atmosphere contains carbon dioxide, which all life forms require.
D. Earth’s atmosphere allows radiation from the sun to pass through it and warm Earth’s surface.