Microscopic Organisms Found in Seawater
This page is the CodyCross answer for the clue below from Cats, Group 1730, Puzzle 1 (Black Stripes).
Question is: Microscopic Organisms Found in Seawater
and the answer is: PLANKTON
Word Meaning:
PLANKTON — (uncountable) Organisms, especially small and microscopic ones, that drift in water.
Definitions from Wiktionary.