Question

why is the presence of the ozone layer important for life on earth? it enhances air quality for breathing. it protects life from ultraviolet radiation. it changes the weather each season. it intensifies the heat from the sun.

Explanation:

The ozone layer is a region in Earth's stratosphere that contains a high concentration of ozone (\(O_3\)) molecules. Ultraviolet (UV) radiation from the sun can be harmful to living organisms, causing skin cancer, cataracts, and damage to plants and marine life. The ozone layer absorbs most of the sun's harmful UV - B and UV - C radiation.

• The option "It enhances air quality for breathing" is incorrect. The ozone layer is in the stratosphere, and the air we breathe is in the troposphere. Ozone in the troposphere (ground - level ozone) is a pollutant.
• The option "It changes the weather each season" is wrong. The ozone layer's main role is related to UV radiation absorption, not weather change on a seasonal basis.
• The option "It intensifies the heat from the sun" is incorrect. Instead, it protects life from harmful UV radiation, not heat.

Answer:

It protects life from ultraviolet radiation.