1. How do invasive species harm ecosystems? a) They create new inter-species interactions that are unsustainable. b) They create hybrid species when they mate with native populations, and the hybrid population grows exponentially. c) They create new competition for limited resources, and they’re often toxic to organisms native to the ecosystem that try to eat them. d) They create new competition for limited resources, and their population growth often isn’t limited by the ecosystem’s established feeding relationships.