Questions: Ozone is both helpful and harmful to life on Earth.

The answer is the first one (T): Ozone is both helpful and harmful to life on Earth.

Explanation:

• Ozone is helpful because it forms a layer in the Earth's stratosphere that absorbs the majority of the sun's harmful ultraviolet (UV) radiation, protecting living organisms from potential damage.
• Ozone is harmful when it is present at ground level, where it can contribute to air pollution and cause respiratory problems and other health issues for living beings. This ground-level ozone is a major component of smog.

In summary, ozone plays a dual role, being beneficial in the stratosphere and harmful at ground level.