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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Evolutionary trade-offs ： ウィキペディア英語版 Evolutionary trade-offs Evolutionary trade-offs have occurred on many levels throughout evolutionary history. There are many functional and genetic trade-offs that have taken place throughout human evolutionary history. ==Functional trade-offs== Human ancestors, such as the neanderthals, had stronger, thicker bones than Homo sapiens today. Thicker, stronger bones were much less likely to break and were therefore beneficial to neanderthals, who lived in harsh conditions. Humans today do not have such thick, strong bones, because, although stronger bones would eliminate the worry of breaking a bone, they would require humans to increase their calcium intake substantially. In the trade-off between the benefits of stronger bones and the detriment of needing more calcium, the negative effects of thicker bones outweighs the positive effects. In many ways, having more sensitive ears could be beneficial to humans, allowing for improved hearing. However, improved hearing would allow humans to hear air molecules moving around, thus providing a constant distraction. With a less heightened ability to hear, humans do not have this distraction.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Evolutionary trade-offs」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.