Habitats, Marine ecology, Carbon sequestration, Carbon - metabolism, Physiological aspects, Plants - metabolism, Aquatic plants, Algae, Marine algae, Comparative analysis, Seagrass, Macroalgae, Seaweed - metabolism, Nitrogen - metabolism, Saltmarsh, Blue carbon, mangrove, pyrolysis, plant cell wall, thermogravimetry, Carbon Sequestration - physiology