Answer:Mutualism
Explanation:a relationship in which both species benefit, is common in nature. In microbiology, there are many examples of mutualistic bacteria in the gut that aid digestion in both humans and animals. Commensalism is a relationship between species in which one benefits and the other is unaffected.
The correct answer is A. Hope this helps! ;)
: Spherical bacteria<span> are called cocci. </span>
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