Organism Relationships Worksheet Packet In Yellowstone National Park, the populations of wolves and moose rise and fall in cycles. Use the graph to answer questions 1 through 8.

1. What variable is plotted on the x-axis?
2. What variable is plotted on the y-axis?
3. How did the Moose population change between 1965 and 1975?
4. What happened to the wolf population from 1973 through 1976
5. Infer how the change in the moose population might have led to the change in the wolf population

6. Draw a conclusion about one likely cause of the dip in the moose population between 1975 and 1980.

7. Predict how a disease in the wolf population during one year might affect the moose population the next year.
8. What type of relationship do the wolves and moose in Yellowstone have?
a. parasite / host b. predator / prey c. competitor / predator d. symbiosis / prey

9. How does the camouflage of a walking stick insect affect the population size of that species?