What would happen if krill disappeared?

The Southern Ocean separates us from Antactica

Barely longer than your thumb and nearly translucent, krill are vital to ocean ecosystems around the world. In the waters that encircle Antarctica, krill are an essential food source for penguins, baleen and blue whales (which can eat as much as four tons of krill per day), fish, seabirds and other marine creatures.

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