Assess learners' ability to design and build a closed terrarium using common household materials appropriate for Pre-K–Grade 2. Require a labeled diagram or photo, a materials list and step-by-step assembly, an age-appropriate explanation of how water, light, and air cycle within the closed system and support plant growth, predictions of changes over four weeks with simple monitoring criteria, and clear safety/care guidance. Evaluate scientific reasoning, cause–effect descriptions, and communication.