Because each culture has its own sets of beliefs and disbeliefs that can influence a person.
"Bad" bacteria because there are also good bacteria that we need in order to live not just healthy, because every person gets sick and we need it for our body. Too much good thing is a bad thing.
Pathogens are bacteria, viruses and fungi that cause disease.
migraines and mental illnesses are NOT caused by pathogens. strep throat is caused bacteria, athlete's foot is caused by a fungus and the common cold is caused by a virus. so given the definition and causes you should be able to figure it out!!
An important part of developing motivation includes understand that motivation is influenced by your ability