Answer:
A virus gets into the human body and then using our cell machinery , it repeoduces itself as it cannot repriduce on its own. According to the type of virus , different viruses may affect different cells and thus affect human body differently.
A.
Strategy 1: find something positive to do in place of that
Strategy 2: see a therapist
Strategy 3: talk to a family member so they could be a positive motivator each day to not do that.
hope this helps:)
There is not necessarily a sad event associated with it