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How did formation of the ozone layer help the development of life on land?

Answer and explanation

Correct answer: It protected from harmful ultraviolet rays

The direct answer is D: the ozone layer protected life on land from harmful ultraviolet radiation. Ozone is a form of oxygen found mainly in the upper atmosphere. It absorbs much of the Sun's damaging ultraviolet, or UV, radiation. When this protection developed, organisms could survive more safely outside water, so land life could develop. Option D is correct. Option A is wrong because ozone does not remove salt from oceans. Option B is wrong because it does not cool Earth's core; the core is deep inside the planet and is unrelated to ozone's protective function. Option C is wrong because ozone does not stop volcanoes. The reasoning is: sunlight includes UV radiation, strong UV can damage living cells, ozone absorbs much of it, and this makes land environments safer. It did not remove every danger, but it provided important protection. Memory cue: ozone is Earth's UV shield.

Related tags

Ozone LayerUltraviolet RaysLand Life

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