Assess learners' ability to design a safe, self‑sustaining closed-jar mini‑ecosystem appropriate for Pre-K–Grade 2: choose age‑safe plants and materials, specify an initial water level and light placement, and create a simple plan explaining—using child-friendly language—how water, light, and nutrients will cycle to keep the terrarium balanced; include a labelled sketch, predicted daily/weekly observations, basic maintenance steps, and safety considerations for a classroom setting.