Alevel生物怎么学？高分笔记分享来了！

　　Alevel生物属于科学类课程，同学们在学习科学类课程时总是绕不开“写报告”的一大难关，报告可以说是论文的plus版，不仅需要大家具有坚实的学科理论基础，还有具有一定的实践分析能力。为帮助大家缓解Alevel生物写作时的痛苦，我们考而思惟世为大家收集整理了一系列高分笔记和Essay写作素材，可在本站搜索取用。

　　For a species to survive, it must reproduce. However, the population is limited by environmental factors and so remains more or less constant over time.

　　一个物种要想生存，就必须进行繁殖。然而，种群受到环境因素的限制，因此随着时间的推移或多或少地保持不变。

　　There is competition between individuals of the same species (intraspecific competition) or between members of different species (interspecific competition) for resources.

　　同一物种的个体之间（种内竞争）或不同物种的成员之间（种间竞争）存在着资源的竞争。

　　Since there is variation within a population, some individuals are less well adapted to a particular environment. The less well adapted are 'weeded out' as the selection acts on the phenotype of the individual.

　　由于种群内部存在差异，一些个体对特定环境的适应性较差。由于选择作用于个体的表型，适应性较差的个体被 "淘汰 "了。

　　These individuals fail to reproduce or die, the more successful ones reproduce and pass on their genes to the next generation.

　　这些个体不能繁殖或死亡，较成功的个体则繁殖并将其基因传给下一代。

　　Note: Adaptations are environment-specific; an advantageous characteristic can become disadvantageous if the environment changes in a particular way.

　　注：适应是针对环境的；如果环境以特定的方式发生变化，一个有利的特性就会变成不利的。

　　The change in adaptation that occurs is called evolution.

　　所发生的适应性变化被称为进化。

　　There are three types of selection that occur in nature

　　在自然界中有三种类型的选择:

　　Stabilizing selection. 稳定化选择

　　Directional selection. 方向性选择

　　Disruptive selection. 破坏性选择

　　In each case we will use the illustration of a population of mammals and the characteristic being selected for or against is fur length.

　　在每一种情况下，我们都将使用哺乳动物种群的例子，被选择的特征是毛发长度。

　　In each situation, the population is normally distributed - there are a few individuals that have very short or very long fur length but most have an intermediate fur length.

　　在每种情况下，种群都是正态分布的--有几个个体的毛发长度非常短或非常长，但大多数个体的毛发长度处于中间水平。

　　以上就是小编为大家整理的Alevel生物知识点细节，希望对大家有所帮助，祝学业有成金榜题名！如有更多有关Alevel课程辅导的需要，欢迎来联系在线客服老师，会获得更多专业的指导哦~