达尔文与《物种起源》主题阅读 — 英语词汇题
题目
根据达尔文与《物种起源》的主题内容，用本单元核心词汇的适当形式补全句子（首字母已给出）：In On the Origin of Species, Darwin explained that living things change slowly over time in order to a______ themselves to their environment, and that all species today share common a______s in the distant past.