Assess the learner's ability to design a complete closed-loop life support system for a two-year crewed Mars mission (assume 4 crewmembers) that integrates bioregenerative elements (plants, algae, microbes) with physicochemical subsystems (CO2 scrubbing, water reclamation, electrolysis). Require a system architecture, quantitative mass and energy budgets (O2/CO2 balances, water, food biomass, waste processing, power and thermal loads), control and automation strategies (sensors, algorithms, fault detection), redundancy and maintenance plans, and at least two detailed failure contingencies with trade-off analysis and recovery procedures. Include key assumptions and basic calculations to justify design choices.