D. People plant different types of flowers in a garden. 相关知识点: 试题来源: 解析 C。解析:自然选择是指生物在生存斗争中适者生存、不适者被淘汰的现象。C 选项中昆虫对杀虫剂产生抗性是因为在使用杀虫剂的环境中,具有抗药性的昆虫能够生存下来并繁殖后代,这是自然选择的一个例子。A 选项是人工选择;B...
试题来源: 解析 B。解析:文中提到“Natural selection is the process by which organisms that are better adapted to their environment are more likely to survive and reproduce.”,自然选择是那些更适应环境的生物体更有可能生存和繁殖的过程。反馈 收藏 ...
首段提出了这个研究发现,第2段到倒数第2段对这一研究作了详细的说明,最后一段是结论,再次重申了这一观点。对比首末两段的内容就可以推断出末段的natural selection等同于首段的genes and evolution,它们都是决定一个人交际类型的因素。反馈 收藏
【题文】 Natural selection is the process by which one type of animal within a species thrives because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth(灰蛾)is an example of the natural selection process. In 19th century...
A. Lamarck's Theory B. Darwin's Theory C. Mendel's Theory D. Watson and Crick's Theory 相关知识点: 试题来源: 解析 B。本题考查生物进化的主要理论。达尔文的理论通过自然选择来解释进化过程。拉马克的理论强调用进废退和获得性遗传。孟德尔的理论主要是关于遗传规律。沃森和克里克的理论是关于 DNA 双...
百度试题 结果1 题目34 Which of the following is a result of natural selection?B A Angus cows B antibiotic-resistant bacteria C navel oranges D seedless grapes 相关知识点: 试题来源: 解析 B 反馈 收藏
根据第一段中“Natural selection is the process(过程)by which one type of animal survives because of certain characters that make it more likely to live than others. The history of the peppered moth(灰蛾)is an example of the natural selection process.(自然选择是一个过程,一种动物之所以能够...
Natural selection often takes hundred or even thousands of years to occur. For the peppered moth, this process occurred comparatively quickly. At the beginning of the Industrial Age, most peppered moths in England were light-colored and covered with black markings, although a few moths had dark-...
of peppered moths were able to better blend(融合)into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection often takes hundred or even thousands of years ...
aA protective relay is a device that may be energized by a voltage signal,a current signal,or both.when energized,it operates to indicate or isolate an abnormal operating condition.basically the protective relay consists of an operating element and a set of contacts. 一个防护中转是也许由电压信号...