4
green mould bread chocolate yogurt
If you need help I recommend you type in the specific question you need help with
mould is a helpful one and bacteria is a harmful one
it can be helpful or harmful
sometimes they are helpful and harmful.
Probably to humans, I wouldn't eat dead leaves. Well yes you wouldn't eat dead leaves but in an eco way they are helpful.
yogurt
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
they are helpful not harmful to plants
harmful