三个类型的湖泊的光合作用对深度的函数曲线

II. 定义 A. 描述生产力的术语 B. 滞留时间和周转率

“大自然自身已经解决了如何在有效范围内捕捉照射到地球上的光线并把所有能量中最难以捕 捉的能量以稳定的形式储存下来

I.什么是生态学 Ⅱl 为什么要研究生态学? ⅡIl 如何研究生态学?

32.1 Biologists name organisms in a systematic way. The Classification of Organisms. Biologists name organisms using a binomial system. Species Names. Every kind of organism is assigned a unique name. The Taxonomic Hierarchy. The higher groups into which an organism is placed reveal a great deal about the organism

49.1 The bodies of vertebrates are organized into functional systems. Organization of the Body. Cells are organized into tissues, and tissues are organized into organs. Several organs can cooperate to form organ systems

1.1 Biology is the science of life. Properties of Life. Biology is the science that studies living organisms and how they interact with one another and their environment

Genes vary in natural populations. Gene Variation Is the Raw Material of Evolution. Selection acts on the genetic variation present in populations, favoring variants that increase the likelihood of survival and reproduction

When Mendel did his crosses of pea plants, he knew what a pea plant was supposed to look like: a small plant with green leaves, purple flowers, and smooth seeds. But if all pea plants were like that, he would never have been able to sort out the rules of heredity—in a cross of green peas with green peas, there would have been no visible differences to reveal the

一、高等植物的遗传学特征 二、植物的基本特征 三、遗传操作的简易性 四、整株植物的再生性 五、染色体的多倍体性