Some sharks remain on the move for their entire lives. This forces water over their gills, delivering oxygen to the blood stream. If the shark stops moving then it will suffocate and die.

Jellyfish like salt water. A rainy season often reduces the jellyfish population by putting more fresh water into normally salty waters where they live.

OMG was added to dictionaries in 2011, but it's first known use was in 1917.

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