The type of relationship that exists between the bacteria living in digestive system and the cows is that of mutualism.
What is mutualism ?
Mutualism is an association or symbiotic interaction between two species where each species gets benefitted from one another.
Since the bacteria that live in the digestive systems of cows help break down the plants that cows eat, providing nutrients to cows and the digestive systems of cows offer a safe environment in which the bacteria can live and reproduce. This fulfills the condition of mutualism.
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