Oceans

The only enemy to the orca or killer whale is which of the following predators?

More Questions from Oceans
On a reef, an individual coral is known as a what?
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Darwin Mounds is a reef found where?
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The average adult blue whale's heart weighs approximately how many pounds?
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What percent of the ocean is salt?
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When did Titanic finally go under the water?
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Which of these animals depends on the ocean currents in order to move?
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The ocean tide is created by earths relationship to which of these celestial bodies?
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What valuable metal is found in the oceans but is expensive to extract?
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