Bioluminescence Quiz: Do You Know About Glow?

From familiar fireflies to deep sea dwellers, all sorts of organisms have evolved the ability to produce their own light. We test your knowledge of this strange and stunning phenomenon known as bioluminescence.
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Single-celled organisms ocean-dwelling, called dinoflagellates, light up when disturbed. This species, Pyrocystis fusiformis, is a spindle-shaped cell about 0.04 inches (1 millimeter) long—just large enough to be seen without a microscope.
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