Oceans

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

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What two natural predators are known to prey on beluga whales other than humans hunting them?
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What do Baleen whales lack that other whales have?
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What is a high place from which rivers flow in all directions?
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OPDS stands for what?
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Coral reef means what as it relates to the environment?
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The Great Barrier Reef lies just off what continent?
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What ocean borders Japan to the east?
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What kind of tail does a shark have?
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