CO2, Oxygen, Nitrogen, Ozone. Water vapour
Bacteria can be both harmful and helpful
Ozone is beneficial in stratosphere. It acts as a pollutant at ground level.
They are helpful because they clean out intestines. they are harmful because they can cause diseases
Ozone blocks UV-B. UV-B directly damages DNA, causing cancer, mutation, and decreased crop yields. So ozone where there is little life (like the ozone layer). is "good". Ozone where we breathe is a powerful oxidant, and damages lung tissue and the breathing structures of plants. How can high speed truck traffic be both harmful and helpful? In your living room, it can cause death. On a nearby road, it can deliver food. All a matter of *where*. The ozone layer protects us from the suns radiation. Holes in the ozone are harmful.Ozone where we breathe is a powerful oxidant, and damages lung tissue and the breathing structures of plants.
Ozone
See "How can ozone be harmful and helpful?" in the "Related questions" section below.
No, it is not, Ozone is actually very helpful.
The ozone is helpful in stratosphere. It protects us from harmful UV rays.
CO2, Oxygen, Nitrogen, Ozone. Water vapour
Helpful in the stratosphere, harmful in the troposphere.
Yes!
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
they are helpful because they are
They are more helpful than harmful. My two gerbils are both helpful. They've helped me in many ways and so that's why I say they're more of helpful than harmful.
Both only when it infects it is harmful