The friendship has changed more deeply and naturally.
It is either naturally acidic or the rocks and minerals around it make it become acidic. This can be harmful to plants.
oh very simple because the help to animals
When lion hungry lion want to eat then lion get harmful
You first need to understand that friendship grows. Nurturing friendship With the right character it will grow.
if they're not handled at a young age they can become vicious.
Take a good look at the friendship and try to find any signs if it can become a relationship, if you find any, then you should ask her flat out.
Cows are helpful by producing milk but are harmful by the amount of methane they create.
They are not very harmful, but if they are respected with care then they with become useful by teaching kids responsibility and creating an open soul to those with animals in mind.
It is in no way harmful as long as it doesnt become a chronic obsession
Grow with eachother. Become closer, and better friends. Then take the next step.
Assuming the Yeti exists... It can be harmful depending if you provoke it or not. As a rule of thumb, don't start screaming at it or trying to frighten it. Then it will most certainly become harmful.