Iguanas are invasive species when they are in an ecosystem. They eat plants and some flowers, like milkweed, which butterflies depend on. Based on this statement, What best describes the impact that the presence of iguanas will have on the population size?
1) The population size of iguanas will decrease due to competition for resources.
2) The population size of iguanas will increase due to the availability of food.
3) The population size of iguanas will have no impact on other species.
4) The population size of iguanas will decrease due to predation by butterflies.