Question

We encounter microorganisms everyday through the food we eat water we drink and the air we breathe but we don't get disease always give reason

Answer 1

These everyday meetings with microbes makes our body habitual yo them and this daily encounter act as a vaccine to us and thus our body don't get any disease from this daily encounter with microbes.

Answer 2

We encounter micro-organisms everyday and don't get diseases so easily since we are immune or our immunity system can fight these micro-organisms.
Also you can add up that all of the microbes we face everyday might not be fast enough to multiply and harm our body and body systems .