Salt, Fresh and Between: teacher key

Bull Sharks, grade 6 edition, written for 6th grade. A bull shark can adjust the salt and water in its body. Read how pups grow, how long bull sharks live and where they swim.

Read the book. Print this page for the key.

Questions and answers

1. How does a bull shark pup get fed before birth?
   • Through a yolk-sac placenta (answer)
   • By hunting
   • By a river
2. As of November 2026, what is the oldest age reported for a bull shark?
   • 3 years
   • 32 years (answer)
   • 300 years
3. What can a bull shark adjust in its body?
   • Its colour
   • Its number of teeth
   • Its salt and water balance (answer)
4. In aquariums, how long have bull sharks lived?
   • 25 years or more (answer)
   • 3 years
   • 1 week
5. A bull shark can swim in fresh water as well as in the salty sea. Where could you find one?
   • On a hill
   • In a river (answer)
   • In a tree
6. What does estuaries mean here?
   • Fish teeth
   • Fish ponds
   • River mouths (answer)

Words

• placenta: pup-feeding organ
• opportunistic: eats what's there
• estuaries: river mouths