1 of 5
Who does Francois initially move to the lead position after Spitz's death?

2 of 5
The Thirty Mile River can take ten days to cross, but Buck leads the pack across it in how many?

3 of 5
Why is the Scotsman unable to get the dogs to pull the sled?

4 of 5
As Buck's inherited instincts grow stronger, everything he encounters in the wild seems ___.

5 of 5
What does the Scotsman do with Dave when Dave is too weak from illness to keep pulling?