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Ocean Animals: The Weirdest Neighbours We Have

SheelonBiologyScienceEnglishGrades K-5Published Aug 5, 2026

Three hearts, no brain, and a mammal that never leaves the water. Ten questions on the animals living in the largest habitat on Earth.

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Questions in this quiz

All 10 shown. Answers not revealed.

  1. What is the largest animal that has ever lived?

    Multiple Choice · 20s

    AThe blue whale
    BThe largest dinosaur
    CThe whale shark
    DThe African elephant

  2. How many hearts does an octopus have?

    Multiple Choice · 20s

    AOne
    BTwo
    CThree
    DEight

  3. Dolphins are mammals, not fish.

    True / False · 20s

    TRUE
    FALSE
  4. What is a shark's skeleton made of?Multiple Choice · 20s
  5. What is the deepest known place in the ocean called? (two words)Type Answer · 30s
  6. Which sea creature has no brain and no heart?Multiple Choice · 20s
  7. In seahorses, the male carries the eggs until they hatch.True / False · 20s
  8. What is bioluminescence?Multiple Choice · 20s
  9. What is coral?Multiple Choice · 20s
  10. How much of the Earth's surface is covered by ocean, roughly, as a percentage?Type Answer · 30s

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