What are the levels of organization for living things

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

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

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.