Why is it important to repeat an experiment several times? OPTIONS:
- to use up all the materials
- to give all the students the chance to participate
- to collect more data to fit the hypothesis
- to determine if the results are similar
A: to determine if the results are similar

In one area, a large source of prey for eagles is rabbits. If the number of rabbits suddenly decreases, what effect will it most likely have on the eagles? OPTIONS:
- Their numbers will increase.
- Their numbers will decrease.
- They will adapt new behaviors.
- They will migrate to new locations.
A: Their numbers will decrease.

Which stimulus causes a porcupine to extend its quills? OPTIONS:
- lunar effect on Earth
- seasonal temperature changes
- threatening behavior by predators
- environmental encroachment by humans
A: threatening behavior by predators

Which of these events have the most influence on regional climate? OPTIONS:
- frequent tornadoes
- ocean trade winds
- winter snowstorms
- temperature inversions
A:
ocean trade winds