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a diagram of a killer whale using echolocation
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Echolocation

 A whale sends out an echolocation whistle using air sacs. It detects the reflected...
a neon purple jellyfish
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Floating Jelly

 This jellyfish, Scolionema suvaense, was raised in the National Museum of...
a diagram comparing the size of a water droplet to the size of a bacteria to the size of a virus
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The Size of a Virus

 Bacteriophages are viruses that infect bacteria. Here, a water droplet is used...