*Question*: In a healthy forest, dead trees and limbs fall to the ground and decompose. Which of these statements best describes why decomposition is important to a forest ecosystem? OPTIONS:
- Nutrients are released when wood is broken down.
- Worms produce oxygen used by other organisms.
- Dead trees provide nest sites for many different species of birds.
- Water is stored in dead trees and limbs.
*Answer*: Nutrients are released when wood is broken down.

*Question*: A fox gave birth to an offspring that had a better sense of hearing than most foxes. How could this small change most likely result in descendants that are different from the original fox? OPTIONS:
- Foxes that have a better sense of hearing may mutate more frequently than other foxes.
- Foxes that have a better sense of hearing may be hunted more frequently.
- Over time, descendants of this fox may hear and hunt prey better than other foxes.
- Over time, descendants of this fox may become extinct.
*Answer*: Over time, descendants of this fox may hear and hunt prey better than other foxes.

*Question*: A group of students found metamorphic rocks near a campsite. The presence of metamorphic rocks is most likely evidence of OPTIONS:
- dinosaur activity
- sediment deposition
- high pressure
- wind-borne sand
*Answer*:
high pressure