Question

What are two ways bacteria provide nutrients to humans?

Answer 1

1. they break down cellulose that humans cannot digest
2. they break down lactose with lactic acid that humans cannot produce

Answer 2

By producing vitamins or breaking down molecules.

Step-by-step explanation:

• Producing vitamins that humans cannot produce by themselves. Lactobacillus, Bifidobacterium, and members of the gut microbiota are examples of probiotics that synthesize vitamin K and others like biotin, pantothenic acid, riboflavin, and thiamine.
• Another way is by breaking down with enzymes molecules that cannot be digested by humans, for example, fiber, starches, and sugars.

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