Assess learners' ability to design a closed-loop bioregenerative life support system for a lunar habitat. Require a detailed account of system components (atmosphere management, water reclamation, food production, waste processing, power and thermal control, radiation shielding), quantitative mass and energy budgets with stated assumptions and calculations, closed recycling cycles and throughput, control/automation and integration with lunar constraints (reduced gravity, regolith use, radiation, limited resupply), and robust contingency/failure mitigation strategies (redundancy, fault detection/isolation, repairable backups, emergency consumables). Responses should justify trade-offs and include key equations and a compact diagram or table.