Question

change in population over time
competitive exclusion relationship
habitat-niche relationship
biotic-abiotic relationship
predator-prey relationship

Explanation:

The graph shows two populations fluctuating in a cyclical pattern where one population peaks shortly after the other declines, which matches the classic dynamic of a predator-prey relationship: as prey population increases, predator population rises due to more food, then predators reduce prey numbers, leading to a drop in predator population, restarting the cycle. The other options do not produce this paired cyclical fluctuation.

Answer:

predator-prey relationship