Marine food chain is a linear, hierarchical model of food consumption and energy transfer in marine ecosystems. Marine food web is a network of marine food chains.
Marine ecosystems are saltwater bodies defined by distinctive physicochemical properties, biological organisms and processes. Marine ecosystems definition
Aquatic ecosystem is a hydrological system or environment that comprises of water, aquatic organisms and hydrological processes. Aquatic ecosystem definition
Biomass pyramid is an ecologic concept whereby the total dry biomass at various trophic levels is depicted in a triangular diagram. Biomass pyramid definition
Biggest deserts in the world are; Antarctic (14,200,000 km2), Arctic (13,900,000 km2), Sahara (9,200,000 km2), Great Australian (2,7000,000 km2), and Arabian Desert (2,330,000 km2).