Final answer:
In bifurcate merging kinship terminology, ego's mother's brother (MB) and father's brother (FB) are called by the same term due to the merging of same-sex siblings into the immediate family.
Step-by-step explanation:
In a bifurcate merging kinship terminology, pairs of relatives are identified by the same kinship term based on their relationship to the ego (the point of reference individual). To answer the question, the pair that would be called by the same term within this system is e: MB and FB, which stands for mother's brother and father's brother. According to bifurcate merging kinship, ego's parents' same-sex siblings are merged into the immediate family. This means that an ego's mother's brother (MB) and a father's brother (FB) would both be referred to as 'uncle' or a culturally equivalent term in many tribal societies, which reflects the merged relationship within the family of orientation. Conversely, the relationships with ego's parents' opposite-sex siblings are bifurcated, meaning they and their offspring fall into a different category, typically referred to as 'cousins'.