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What is the biggest living fish in the ocean?
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Great white shark
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Whale shark
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Oarfish
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Manta ray
Which marine reptile can live in both saltwater and freshwater?
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Marine iguana
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Leatherback turtle
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Green sea turtle
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Crocodile
What type of animal are sea anemones most closely related to?
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Starfish
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Crabs
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Jellyfish
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Coral
What is the main component of a coral reef's structure?
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Chitin
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Calcium carbonate
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Phosphorus
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Silicon dioxide
What are baby sharks called?
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Fry
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Hatchlings
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Cubs
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Pups
What is the primary diet of baleen whales?
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Seagrass
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Small fish
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Squid
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Krill
What is bioluminescence primarily used for in deep-sea creatures?
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Communication and predation
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Photosynthesis
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Temperature regulation
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Navigation
Which marine creature is known for its ability to change color rapidly?
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Jellyfish
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Manta ray
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Squid
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Sea urchin
What is the largest species of sea turtle?
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Leatherback sea turtle
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Loggerhead sea turtle
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Hawksbill sea turtle
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Green sea turtle
Which of these whales is the largest animal on Earth?
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Killer whale
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Blue whale
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Humpback whale
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Sperm whale
Which ocean is the deepest?
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Arctic Ocean
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Pacific Ocean
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Atlantic Ocean
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Indian Ocean
Feared for their incredibly potent sting, what type of creature is considered the most venomous marine animal in the world?
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Pufferfish
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Portuguese man o' war
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Box jellyfish
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Blue-ringed octopus
Which marine crustacean is famous for its incredible punching speed and powerful strikes that can break glass aquarium walls?
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Krill
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Hermit crab
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Mantis shrimp
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King crab
Which type of plankton is responsible for producing much of Earth's oxygen?
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Radiolarians
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Zooplankton
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Bacterioplankton
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Phytoplankton
What is the term for animals that live on or near the ocean floor?
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Nekton
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Pelagic organisms
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Plankton
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Benthic organisms
Which of these marine animals is a mammal?
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Seahorse
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Shark
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Octopus
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Dolphin
Beachgoers may have come across these cool, flat treasures with a star on top. What are they called?
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Sand cookie
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Sea star
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Sand dollar
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Sand crab
Which fish is known for its deadly toxin, tetrodotoxin?
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Pufferfish
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Lionfish
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Stingray
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Moray eel
What causes red tides?
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Underwater earthquakes
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Algal blooms
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Oil spills
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Volcanic eruptions
What adaptation allows fish to control their buoyancy?
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Lateral line
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Dorsal fin
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Swim bladder
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Gills
