Hydrogen atoms are essential to man, as hydrogen is a key element in our bodies. Hydrogen gas, however, is flammable and potentially toxic.
No, it is acually very helpful.
If you need help I recommend you type in the specific question you need help with
AH! i love pointless questions like these!!! he is helpful man
yes they r cool
it can be helpful or harmful
sometimes they are helpful and harmful.
Sandpaper is both helpful and harmful.
Bacteria can be both harmful and helpful
they are helpful not harmful to plants
harmful
Helpful
helpful