Why is it important for a Biologist to include a control group in an
experiment?

There is no reason for determining without a control group whether a given outcome is due to the variable being evaluated or to any other cause. It is less likely that effects will be tampered with if it is unclear which category subjects are in.

Explanation:

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the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

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-lavira: )