a. Bacteria are important for human beings.
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Importance of bacteria to humans
Most bacteria are good for us
The bacteria in our bodies help degrade the food we eat, help make nutrients available to us and neutralize toxins, to name a few examples. Also, the microbiota play an essential role in the defense against infections by protecting the colonized surfaces from invading pathogens.
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it tri but some bactria are harful
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