Q2.18. You are studying a population of wild coyotes and notice that every three years there is an epidemic of a bacterial disease. Which of the following best explains this

periodic cycling of the disease? a.New coyotes are continuously born into the population. b.Coyotes are dying from other causes over time. c.During an outbreak, the proportion of coyotes who are sick with the disease slowly falls as they recover. d.Coyotes from other populations, who have already caught and recovered from the disease, immigrate into the study population.