Following Bull Sharks: teacher key

Bull Sharks, grade 9 edition, written for 9th grade. Scientists follow bull sharks with tags and trackers. Read what the tags show about how far the sharks go, how deep and when.

Read the book. Print this page for the key.

Questions and answers

1. How long did the tagged bull sharks keep their tags, at most?
   • Up to 85 days (answer)
   • Up to 85 years
   • Up to 85 minutes
2. What did the young bull sharks do in the river tracking study?
   • Stayed still
   • Moved upstream by day and downstream at night (answer)
   • Left the water
3. How much does a newborn bull shark weigh?
   • 1 gram
   • 150 kilograms
   • 1.5 to 3.0 kilograms (answer)
4. What does the page show about bull shark size numbers?
   • Several different numbers are reported (answer)
   • Only one number exists
   • Nobody has reported any
5. What does median mean here?
   • The biggest number
   • The middle number (answer)
   • The last number

Words

• satellite: space-linked
• median: the middle number
• dietary: about food