EXPLANATION/ANSWER:
Bacteria affect human life in three ways:
0. Decomposer - Bacteria decompose organic materials, thus, when humans die, the human body is broken down into organic materials that will mix with the soil.
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1. Fermentation - Beer, bread, and yogurt are some examples of fermented food made possible by fermentation bacteria. Lactic acid bacteria like ,Lactobacillus spp. ,and ,Streptococcus thermophilus, break down milk to create fermented dairy products such as yogurt and cheese.
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2. Infection and diseases - Bacteria can cause infection and diseases when it enters the body.