This document explores the dynamics of ecosystems in response to environmental changes. It aims to help students categorize these changes into short-term, seasonal, and long-term events based on their duration, frequency, and ecological impact. The resource includes group roles for collaboration, activities for brainstorming hypothetical examples, and case studies for analysis. Students will work together to understand how different changes, such as forest fires, seasonal migrations, and deforestation, affect ecosystem stability and biodiversity. The document also incorporates retrieval practice and reflective questions to deepen understanding.