Assess undergraduate-level understanding of the chemical mechanisms driving ocean acidification (CO2 uptake, carbonate chemistry shifts, pH and aragonite/calcite saturation) and how these processes vary in coastal systems (estuaries, upwelling zones, seagrass beds, mangroves, intertidal zones). Test ability to explain ecological consequences for calcifiers, larval development, species interactions and community structure, to interpret simple water-chemistry datasets (pH, alkalinity, Ωarag), and to evaluate monitoring and management responses in coastal contexts.