Bottom Of The Aquatic Food Chain Crossword Clue — 5 Letters

One confident answer with explanation of the wordplay

ALGAE
Best match
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Algae (and phytoplankton) form the base/bottom of the aquatic food chain, serving as the primary producers in marine and freshwater ecosystems. ALGAE is exactly 5 letters and is a classic crossword answer.

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Other possible answers
KRILLKrill are near the bottom of the marine food chain, feeding on phytoplankton and being eaten by larger animals.
CORALCoral reefs support the base of many aquatic food chains.
PLANKShort for plankton, which is at the bottom of the aquatic food chain, though this is a stretch.

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