1. What happens to a population when resources such as food, water, and shelter become limited?
2. A wildfire burns through a forest, destroying many trees and reducing available shelter for animals. This is an example of:
3. Which of the following is an example of a seasonal change affecting population size?
4. If a disease spreads through a population of deer, what is the most likely effect?
5. What is an example of a long-term change that could affect population size?
6. A flood temporarily forces animals to relocate.
7. Wolves reintroduced to Yellowstone National Park change the food chain.
8. Leaves fall off trees each autumn.
9. A factory releases pollution, making the air toxic for decades.
10. A drought lasts for several months, drying up a lake.