Oceans

What is the funnel-shaped opening beneath an octopus's head that secretes a black fluid when threatened?

More Questions from Oceans
When did the National Hurricane Center begin to give official names to storms?
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What South American fish can generate a 600-volt shock?
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What is a scientist who studies life in the ocean called?
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Dissolved salt makes up what percentage of ocean water?
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The hadal zone begins at what depth?
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What is a cataract in a river?
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The tidal mouth of a large river best fits what geography term?
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A wave form that moves forward with a steady velocity is called what?
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