The correct answer is oxygen minimum zone
Plankton is made up of phytoplankton ("sea plants") and zooplankton (zoh-plankton), which are microscopic organisms found near the surface of aquatic habitats. Zooplankton, like phytoplankton, are often weak swimmers that drift with the currents. Plankton are divided into two groups: permanent members (such as diatoms, radiolarians, dinoflagellates, foraminifera, amphipods, krill, copepods, salps, etc.) and transitory members (such as most larval forms of sea urchins, sea stars, crustaceans, marine worms, some marine snails, most fish, etc.). Along with phytoplankton, zooplankton are important components of marine ecosystems, serving as the foundation of the majority of marine food webs.
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