I would probably guess plankton is made up of tiny plants (called phytoplankton) and tiny animals (called zooplankton). These are so small you cannot see them without a microscope and they can be a single cell big
The smallest plant in the world is probably something like algae or phytoplankton like Emma said, although the smallest flowering plant in the world is watermeal (or duckweed), an aquatic plant that produces a flower about the size of a grain of salt.
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anon-218619 commented on :
wow that is very small!