在学习《动物与环境》一课时,我们实验小组发生了这样一件事: 按照对比实验的要求,在一个纸盒内平铺上干土和湿土,将蚯蚓均匀的放在盒内,10分钟后,我们发现有7条钻进了干土,2条留在干、湿土交界外,1条爬在湿土的上面,可是别的实验小组却发现大多数蚯蚓爬向了湿土。 是什么原因造成了这一差异呢?在老师 When we were studying Animal and Environment, one of the things that happened to our experimental group was that, in accordance with the requirements of the comparative experiment, dry soil and wet soil were laid flat in a carton, and the earthworms were uniformly placed in the box. 10 Minutes later, we found that seven drilled into dry soil, two left dry and wet soil junction, one climbed above the wet soil, but other experimental groups found that most of the earthworms crawled to the wet soil. What caused the difference? In the teacher