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169. natural selction 自然选择 170. a little more than a hundred yeras 一百多年 171. what is called 所谓的 172. trace to 从 寻找根源;从 研究 173. state of mind 心态 174. and so on诸如此类 175. partly because and partly because 部分是因为 部分是因为 176. be held responsible for 被认为应该对 负责 177. be given credit for 为 受到称赞 178. with it 随之 | 
