Which of the following statements about ozone (in Earth's stratosphere) is not true?
A. Without this ozone, Earth would not have a stratosphere.
B. Ozone is a form of oxygen.
C. The presence of ozone was crucial to the origin of life some 4 billion years ago.
D. Ozone absorbs harmful ultraviolet light from the Sun.
Ans: C. The presence of ozone was crucial to the origin of life some 4 billion years ago.
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