Answer:
the immune system.........
Explanation:
There are two ways bacteria can harm the human body:
toxicity
the bacteria produce toxins which damage specific tissues in the body.
At a chemical level, there are two main types of bacterial toxins, lipopolysaccharides, which are associated with the cell wall of Gram-negative bacteria, and proteins, which are released from bacterial cells and may act at tissue sites removed from the site of bacterial growth.
invasiveness
the bacteria multiply rapidly at the site of infection and overwhelm the body's defence mechanisms.
example
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Answer: Cardio
Explanation: Cardio exercises such as running, treadmill activities, and jogging strengthen the heart.
