You are analyzing observational data on interactions between populations of two species in a community colleceted over 24 years. Here are the data on a 2-species graph. 70 60 50 20 Number of Species B 20 20 7 6 5 4 3 2 1 8 -> 9 10 11 12 13 14 15 16 10 10 Numbers = Observation year 17 18 19 20 0 0 10 20 30 40 50 60 70 80 Number of Species A

I’m not quite sure which answer would describe the graph can you please help?

Two species of leaf-eating lizards (species A and B) have coexisted on an isolated island for more than 10,000 years. In 1964, a third species of leaf-eating lizard (species C) was accidentally introduced by humans visiting the island. The graph below shows the population sizes of the three species since that time: Variation in Population Density of Lizards Population Density 45 40 44 35 30 25 20 Species A Species B Species C 10 5 0 1964 + 1974 1984 1994 2004 Year Describe the effect that the introduction of species C had on the population densities of species A and B. Explain what could have caused the introduction of species C to have an effect on the population densities of species A and B. (4 points)

Use the logistic equation to estimate population size two generations (Nt+2) after a population was counted  as having 1,000 individuals (=N0), with a carrying capacity = 5,000 and r = 0.3 The subject is ecology.