One Squid, One Ocean: teacher key

Giant Squid, grade 11 edition, written for 11th grade. DNA says giant squid everywhere are one species. How can an animal of the deep sea stay so alike across the world's oceans?

Read the book. Print this page for the key.

Questions and answers

1. What did the 2013 DNA study show?
   • Giant squid live only in one sea
   • Giant squid around the world are one species (answer)
   • Giant squid are not squid
2. Why did researchers reason that giant squid must migrate?
   • They have wings
   • They were seen migrating
   • They are so alike genetically that the breeding population must be well mixed (answer)
3. Where have juvenile giant squid been taken from?
   • The stomachs of deep-sea fishes (answer)
   • Lakes
   • Rivers
4. How did researchers come to the idea that giant squid migrate?
   • By reasoning from how alike their DNA is (answer)
   • By following one with a tag
   • By asking fishermen
5. How many rows of suckers are on the arms?
   • Four
   • Six
   • Two (answer)

Words

• migrate: travel far
• genetically: by DNA
• juvenile: young animal
• trawls: fishing nets