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Marine Biology


  1. How many limbs does a squid have?
  2. The Great Barrier Reef is located in which sea?
  3. Which crabs occupy empty scavenged mollusc shells to protect their fragile exoskeletons?
  4. Is a Sea Sponge an animal, plant or coral?
  5. If the pelvic fin is found at the bottom of a fish, what name is given to the tail fin?
  6. Shark skeletons are made of what?

  7. Which ocean has the warmest surface temperature of all the world's oceans?
  8. What, with 2000 different species, have no blood or brain, yet are able to digest food outside their body?
  9. If phytoplanktonh are plants, what name is given to animal plankton?
  10. Which fish are the largest in our oceans?
  11. Which small fish with venomous spines on their dorsal fin are found buried in the sand in UK coastal waters?
  12. Which marine mammals are also known as sea cows?
  13. Xiphias gladius is the scientific name for which fish?
  14. Found clinging tightly to rocks, which marine mollusc has a shallow conical shell and a broad muscular foot?
  15. In the 2003 American animated film "Finding Nemo" what type of fish are both Nemo and Marlin? (Hint: the name is circus related)
  16. What does the acronym 'scuba' stand for?
  17. Which zone with a name meaning "open sea" refers to the open, free waters away from the shore?
  18. Which jellyfish is considered the most venomous marine animal?
  19. What is the only animal where the male gives birth?
  20. Which extremely biodiverse islands are home to the marine iguana, the only lizard with the ability to live at sea?
  21. Meaning "head foot" in Greek, what group do octopus, squid, cuttlefish, and nautilus belong to?
  22. Which word is defined as a community of living organisms that live in and interact with each other in a specific environment?
  23. True or false? The speed of sound in water is a lot faster than the speed of sound in air?
  24. Also known as devilfish, what type of fish are mantas?
  25. Which small marine crustaceans gets their name from the Norwegian word meaning "small fry of fish"?
  26. Crabs are covered with a thick exoskeleton composed primarily of which highly mineralized material?
  27. What color is octopuses' blood?
  28. Which branch of zoology is devoted to the study of fish?
  29. Can you name the largest living species of turtle?
  30. To the nearest mile, how deep is the Mariana Trench at its maximum depth?


  1. 10 limbs (eight arms and two tentacles)
  2. The Coral Sea
  3. Hermit crabs
  4. Animal
  5. The caudal fin
  6. Cartilage
  7. The Indian Ocean
  8. Starfish
  9. Zooplankton
  10. Whale sharks
  11. Weever fish
  12. Manatees
  13. Swordfish
  14. Limpet
  15. Clown fish
  16. Self Contained Underwater Breathing Apparatus
  17. The pelagic zone
  18. Box jellyfish (Australian box jellyfish)
  19. Seahorses
  20. The Galapagos Islands
  21. Cephalopods
  22. Ecosystem
  23. True (the speed of sound in water is over four times faster than the speed of sound in air)
  24. Rays
  25. Krill
  26. Chitin
  27. Blue
  28. Ichthyology
  29. Leatherback turtle
  30. 7 miles