primary producer

noun Biology.
any green plant or any of various microorganisms that can convert light energy or chemical energy into organic matter.

Origin:
1925–30

primary production, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Phytoplankton is a primary producer in aquatic ecosystems, the source of energy for organisms up the food chain.
Intra-seasonal dynamics in primary producer compartments.
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