Muscle Movers

This passage explains how worms move using muscles and bristles instead of legs or fins. Students learn that worms create a wave-like motion called peristalsis by contracting and relaxing their segmented muscles. Their tiny bristles, known as setae, help them grip the soil as they move. The passage also explains how worms dig tunnels that loosen soil and allow air and water to reach plant roots, making them vital to ecosystem health.

Students gain a stronger grasp of scientific vocabulary and biological processes like peristalsis and setae. The passage enhances cause-and-effect reasoning by showing how worms’ movements benefit both themselves and the environment. It supports informational sequencing skills as readers follow step-by-step explanations. Additionally, students practice text structure recognition, learning how paragraphs explain interconnected scientific ideas.