Test the candidate's ability to design a complete space mission concept to detect and confirm atmospheric biosignatures on a temperate, Earth-sized exoplanet: define science objectives and target-selection criteria; propose mission architecture and platform (space telescope, formation flying, starshade/coronagraph); specify instruments and observing modes (spectral ranges, resolution, S/N estimates); outline observation strategy, calibration, and data-analysis methods to discriminate biosignatures from abiotic false positives and stellar/activity noise; include technology readiness, resource and risk trade-offs, timeline/milestones, and a verification/follow-up plan integrating ground-based and space assets. Assess justification of choices and feasibility within realistic constraints.