ANSWERS: 4
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The light that you are shining. :-) . Some organisms have bacteria living in their bodies that are bioluminescent. They use these to attract prey or scare away predators.
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They're radioactive
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Jellyfish can bioluminesce when they are stimulated. The luminescent light produced is bluish in color, attributable to a molecule known as aequorin, but in a living jellyfish it is emitted via a coupled molecule known as GFP, or green fluorescent protein, which causes the emitted light to appear green. See this website for a clear explanation and nice pictures http://faculty.washington.edu/cemills/Aequorea.html
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Its all that junk that flows into our oceans from sewers and river mouths.
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