Substances can be useful when they are used as intended, such as medications to treat illnesses. They can be harmful when used inappropriately or in excess, leading to addiction, health issues, or even overdose. Proper education and monitoring of substance use is essential to ensure their safety and efficacy.
Clamidamonas are photosynthetic creatures.They are not harmful.
media is very useful
The Antarctic ozone hole is not useful. It was harmful.
Rusting is an oxidation reaction.
Drinking and smoking while pregnant are known harmful effects on a developing baby in the womb.
lion are useful and harmful
It is not harmful. Also it is not useful
To allow useful substance in and hold back the harmful ones in the blood, which helps in purification.
The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
useful
i think its both harmful and useful
Ozone at ground level is harmful. It is useful in stratosphere as it protects us from harmful UV rays.
It is useful because we can breathe it.
useful for dieing (;
It is USeful
changes both harmful and useful
A carbohydrate can be useful or harmful depending on the type that is eaten. Good carbohydrates have fiber in them.