1. The problem is to understand the impact of invasive species on ecosystems and the efforts to control them. 2. Passage 1 defines invasive species as plants or animals that spread to areas where they do not naturally occur and cause harm. 3. It explains that invasive species like the northern snakehead fish can disrupt ecosystems by having no natural predators and consuming native species. 4. Measures to control invasive species include banning importation, draining ponds, poisoning, and inspections. 5. Passage 2 highlights the debate on resource allocation, noting that while invasive species are a concern, other environmental issues like pollution and deforestation also need attention. 6. The key takeaway is that preventing the spread of invasive species is important but should be balanced with other environmental priorities. Final answer: Invasive species cause significant ecological harm and require control measures, but efforts must be balanced with other environmental concerns.