一个句子的句子结构分析帮忙分析此句子结构Whether it stems from the common ancesto

完整的句子应该是：However,whether such a sense of fairness evolved independently in capuchins and humans,or whether it stems from the common ancestor that the species had 35 million years ago,is,as yet,an unanswered question.
if（…or ）,whether（…or not）引导的名词从句是由一般疑问句或选择疑问句转化而来的,其功能和wh?从句的功能相同.翻译时,译为"是否",采用顺译法
该句子为主系表结构.whether引导由or并列的两个主语从句whether such a sense of fairness evolved independently in capuchins and humans和whether it stems from the common ancestor that the species had 35 million years ago,译为"是……,还是……"