2 factors that could affect the current oxygen and carbon dioxide levels, and then predict possible effects of the levels changed. ps... please I need to have a clear and reasonable answer​

Abiologist counts the number of rabbits in a population each year and observes a decrease in population. since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. which describes the biologist’s actions? a.) experimentationb.) inferencec.) observationd.) interacting