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Microorganisms can entre in our body by many ways.for example they can come in our body through our mouth,nose,ear. as they are very small,they can even come in through very small openings such as the pores of our skin.We might breathe bacteria that are suspended in the air or eat bacteria that is in your food.thats why it is so important to cook the food well and live in a clean and healthy environment.Also,bad bacteria can enter very easily through cuts and other injuries,which is why it's so important to keep wounds clean.
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