Some animals glow under ultraviolet light. Jellyfish are a prime example of these glowing animals. Under normal conditions, worms do not glow.
However, scientists have been able to genetically alter some worms so that they will glow under an ultraviolet light. To do this, scientists engage in genetic engineering. They inject the gene that makes jellyfish glow into the worm.
Even though jellyfish and worms are very different animals, their genes, like the genes of most living things, are actually quite similar. So, the worms with the injected gene will glow just like jellyfish do.
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Cool! I never knew that!