both, depending on circumstances
yes some chemical reactions are harmful to us. as digestion of food, photosynthesis, decomposition of organic waste are some examples of the useful chemical reactions.
Methane gas is released, as well as carbon dioxide, during decomposition.
changes both harmful and useful
The internet can be useful and harmful.
Harmful bacteria will harm you. Helpful bacteria will help you.
it is harmful because... if thge flies... will...
yes some chemical reactions are harmful to us. as digestion of food, photosynthesis, decomposition of organic waste are some examples of the useful chemical reactions.
lion are useful and harmful
It is not harmful. Also it is not useful
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
Methane gas is released, as well as carbon dioxide, during decomposition.
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