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the factor required for growth of a plant or phytoplankton that is available in the least supply is defined as

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The factor that is necessary for the growth of plants or phytoplankton, which is available in the smallest amount, is known as the Limiting factor. Phytoplankton, which forms the foundation of the marine food chain, can remove around 50 Pg of carbon yearly or approximately half of the world's CO2 emissions. This makes these minuscule photosynthetic beings a vital component in the regulation of the Earth's climate and the amount of CO2 in the atmosphere. Due to the reliance of phytoplankton on sunlight, they are only able to process CO2 in the uppermost and sunlit portions of the ocean, known as the euphotic zone. Although high concentrations of CO2 in saltwater exist, phytoplankton development is usually not hindered. Inorganic nutrients crucial for primary production in the ocean, including inorganic nitrogen, phosphorus, iron, and/or silica, are typically insufficient in most surface waters. Nutrient recycling or mixing-in of nutrients from deeper layers of water primarily maintains phytoplankton growth. "New" nutrients or "external" nutrients, however, only support a small percentage of primary production, and it is the sum of carbon that can be permanently accumulated in the deep ocean due to these nutrients. To learn more about Phytoplankton, please visit: brainly.com/question/10279696 #SPJ4