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13x13 · 20 words · hard
PHYTOPLANKTON, FORAMINIFERA, RADIOLARIAN, ZOOPLANKTON, FLAGELLATE, PARAMECIUM, NOCTILUCA, PLANKTON, AMPHIPOD, TUNICATE, COPEPOD, OITHONA, DIATOM, COLONY, ISOPOD, LARVAE, LARVA, SPORE, SHELL, KRILL