Q: Iron oxides, such as rust, form when iron metal reacts with oxygen in the air. What are the chemical symbols for the two elements found in iron oxide? OPTIONS:
- I and O
- Ir and O
- Fe and O
- Pb and O
A: Fe and O

Q: If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live? OPTIONS:
- The population of deer will increase.
- The population of deer will decrease.
- The population of deer will remain the same.
- The population of deer will become extinct.
A: The population of deer will increase.

Q: Moving water in a river is considered a renewable resource because it OPTIONS:
- carries dissolved oxygen
- easily erodes sediments
- is made of natural gas
- can be recycled by nature over time
A: can be recycled by nature over time

Q: Scurvy is a disease that sailors often got on long voyages. It was discovered that scurvy could be prevented by eating oranges and lemons. This suggests that scurvy is a disease caused by OPTIONS:
- exposure to sea air
- a nutritional deficiency
- a microorganism
- lack of exercise
A:
a nutritional deficiency