Final answer:
El Niño and La Niña impact global weather patterns by affecting rainfall and marine ecosystems.
Explanation:
El Niño and La Niña are both climate phenomena originating in the Pacific Ocean that impact global weather patterns. They both influence the rainy/dry weather conditions worldwide, affecting regions differently with either heavier or lower than usual rainfall. Additionally, they can cause significant disruptions to marine ecosystems and fisheries due to changes in ocean temperatures and nutrient availability.
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