C) How will the allele frequency change in the rat population?

It could change in many ways,

Explanation:

as genetic mutations have many stimulants and triggers, for a precise answer you need  region, species and  predators /prey including weather and life conditions to specify mutations path.

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.

hope i

-lavira: )