Not every modern human has the same set of Neanderthal DNA, however; different people will, by chance, have inherited different fragments. But there are also some areas, termed "Neanderthal deserts," where none of the Neanderthal DNA seems to have persisted. Notably, the largest Neanderthal desert is the entire X chromosome, raising questions about whether this reflects the evolutionary fitness of genes there or mating preferences.
[41]服务零售额是指企业（产业活动单位、个体户）以交易形式直接提供给个人和其他单位非生产、非经营用的服务价值总和，旨在反映服务提供方以货币形式销售的属于消费的服务价值，包括交通、住宿、餐饮、教育、卫生、体育、娱乐等领域服务活动的零售额。
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