The statement that supports the hypothesis that bacteria have a mutually beneficial relationship is "Mice that were made 'germ-free' didn't absorb and metabolize nutrients as well."
After long years of evolution, it's hypothesized that host-bacterial associations have developed into more prosperous relationships, creating biological mechanisms that mutually benefit both the host and the microbes. Many examples of this theory are present in mammals.
Gut bacteria in humans, for example, seem to contribute to non-infectious immune disorders like autoimmunity and inflammatory bowel disease. It's still not fully known yet how they work, but the ongoing research shows finding and concepts that describe the mutualism between humans (gut) and gut bacteria.
Your question seems incomplete, but the completed version is most likely as follows:
Which of the following would support the hypothesis that bacteria have mutually beneficial relationships with us?
Learn more about gut bacteria at https://brainly.com/question/14967790
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