Factopus

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LESSON 2 · Water: Earth's Scarcest Treasure

PAUSE TO THINK

Can fish smell a dead zone coming?

Yes — and they flee

As oxygen drops, mobile fish and shrimp sense the change and swim away while they still can. Slow bottom-dwellers like clams and worms cannot escape and suffocate in place, which is why a dead zone's seafloor goes silent first.

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