Is there such thing as good or bad bacteria?

No

Explanation:

Good bacteria, also known as beneficial bacteria,are defined as ANY BACTERIA that are beneficial to the body and enhance health. One of the most well known types of good bacteria are probiotics. Actually, most bacteria are good. Comparatively speaking, there are only a handful of BAD BACTERIA out there.

answer; i believe that the correct answer is (b) is a factor associated with physical activity and heart disease;

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