If scientists identify an animal with bilateral symmetry and no segmentation, which phylum can it definitely not belong to?
a. roundworms
b. mollusks
c. annelids
d. flatworms

the flagellates share a facultative mutualist association with termites. mutualism is a biological interaction between individuals of different species, where both benefit from each other. this is called cooperation and it differs from other interactions such as cases of exploitation, such as parasitism, predation. in this interaction called association, both species cooperate and benefit.