Alien species are a threat to native species. Justify taking examples of an animal and a plant alien species.
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Native to the Caspian and Black Seas, Zebra mussels (Dreissena polymorpha) affect fisheries, mollusc diversity, and electric power generation in the Great Lakes in North America and Mississippi basin
Native to the Amazon basin, water hyacinth (Eichhornia crassipes) has invaded tropical habitats worldwide spreading to more than 50 countries on five continents. Water hyacinth blocks waterways, decimates aquatic wildlife and the livelihoods of local people and creates ideal conditions for disease and its vectors
Native to the Indian sub-continent, the ship rat (Rattus rattus) have caused extinctions and catastrophic declines of native birds on islands and have spread throughout the world
Deadly new disease organisms, such as avian influenza A (H5N1), attack humans and animals, in both temperate and tropical countries
Native to the Amazon basin, water hyacinth (Eichhornia crassipes) has invaded tropical habitats worldwide spreading to more than 50 countries on five continents. Water hyacinth blocks waterways, decimates aquatic wildlife and the livelihoods of local people and creates ideal conditions for disease and its vectors
Native to the Indian sub-continent, the ship rat (Rattus rattus) have caused extinctions and catastrophic declines of native birds on islands and have spread throughout the world
Deadly new disease organisms, such as avian influenza A (H5N1), attack humans and animals, in both temperate and tropical countries
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