what do you think have an immune system for it s for killing germs but it needs germs to practice on if you kill all the germs around you and live a completely sterile life then when germs do come along you re not going to be prepared thinkoutsidethebox
What do you think have an immune system for It s for killing germs but it needs germs to practice on If you kill all the germs around you and live a completely sterile life then when germs do come along you re not going to be prepared thinkoutsidethebox