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EXPLANATION/ANSWER:
The term "plankton" comes from the Greek word "planktos" which means wandering. Planktons are microscopic organisms that are floating and being carried by tides and currents. There are two types of planktons: phytoplankton and zooplankton. Phytoplanktons are aquatic microorganisms that have chlorophyll and can make food from sunlight. Zooplanktons are aquatic microorganisms that consume phytoplanktons or other zooplanktons.