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Plankton refers to a diverse group of organisms that live in aquatic environments and are unable to actively swim against currents. These tiny drifters play a crucial role in marine food chains, serving as a primary source of nourishment for many fish species and other marine life. Plankton can be divided into two main categories: phytoplankton, which are plant-like organisms that use photosynthesis to convert sunlight into energy, and zooplankton, which are animal-like organisms that feed on other plankton or organic matter. Phytoplankton are responsible for producing half of the world's oxygen and play a significant role in regulating the Earth's climate by sequestering carbon dioxide from the atmosphere. Zooplankton, on the other hand, serve as an important link between primary producers and higher trophic levels, helping to transfer energy up the food chain. Plankton can be found in both freshwater and marine ecosystems, ranging from polar oceans to tropical coral reefs. Despite their small size, plankton have a significant impact on the health and productivity of aquatic environments, making them an essential component of global biodiversity.