一、本探究在教材中所处的地位与作用本探究是人教版《生物学》八年级下册第七单元第三章“生物的进化”中分析生物进化原因的一个探究活动。教材是想通过本探究活动,让学生从感性上认识生物进化的过程和原因,使学生初步认识到:遗传和变异是生物进化的基础,环境的改变是生物进化的外在动力,生物只有适应不断变化的环境才能生存和繁衍; First, the status and role of this study in textbooks This study is a research activity to analyze the causes of biological evolution in the third chapter of the eighth unit of the eighth grade of biology in the PEP edition. The textbook is intended to enable students to perceive the process and causes of biological evolution from the perspective of sentiment so that students can initially recognize that genetics and mutation are the basis of biological evolution. Environmental changes are the external forces of biological evolution. Only biological adaptation The ever-changing environment can survive and multiply;