【正确答案】正确答案：Some phonological factors can affect the appearance of morphemes, namely, the form of a morpheme ; and there could be assimilation, and dissmilation. For example, the negative morpheme could be realized as "in-" or "im-" followed by different phonological environments, as in "inefficient" and "imperfect" , as a result of assimilation. Morphemes can also be conditioned by morphological factors; for example, the allomorphs of the plural morpheme, as could be seen in "oxen" , "cows" , and "feet".