| A | What does the default cCritter::collide method do? Which quantities does it conserve ? |
| B | How many pairs of critters can be found in a set of ten critters? In a set of 100 critters? |
| C | What is the meaning of the cCritter _collidepriority field? How is it used in the cCritter::collidesWith method? And, finally, where is the collidesWith method used? |
| D | Where does the Pop Framework keep a cCollider *_pcollider object? What is the purpose of this cCollider object? |
| E | Why does the Pop Framework choose to implement cCollider as a linked list instead of as an array? |
| F | How does the cCritterWall::collide differ from the normal cCritter::collide ? |