In some national parks, controlled fires are maintained by firefighters. Which of these is one of the major reasons for using controlled burns to maintain certain ecosystems? OPTIONS:
- to give nonnative plants a chance to colonize the region
- to prevent the spread of pests that cause damage to plants
- to replace matured plants with saplings of the same species
- to rid the forest floor of accumulated deadwood and brush
A: to rid the forest floor of accumulated deadwood and brush

Which change would most likely cause deer to die or leave a woodland? OPTIONS:
- a forest fire
- a rainstorm
- a snow storm
- a sinkhole
A: a forest fire

If a student gets a chemical splashed into an eye, what is the most appropriate first action to be taken? OPTIONS:
- wipe it with a paper towel
- call 911 for emergency services
- have someone go get the school nurse
- flush the eye with water at an eyewash station
A: flush the eye with water at an eyewash station

Reptiles become more active as the day gets warmer. This is because OPTIONS:
- they have scaly skin.
- they have slimy skin.
- their body temperature stays at a constant level.
- their body temperature changes with the environment.
A:
their body temperature changes with the environment.