Final answer:The analogy 'Canal : River' indicates how canals function as corridors that connect unlinked water bodies, facilitating the movement of species and creating new routes. Canals like the Erie and Main-Danube have been vital in transportation and trade, but also pose ecological challenges due to invasive species.Explanation:The analogy Canal : River :: introductions following the creation of a canal, connecting two previously unconnected bodies of water, is established based on the function of a canal. Canals are man-made waterways that often serve as corridors linking natural bodies of water such as rivers, lakes, or seas. They enable the movement of aquatic species, goods, and ships, creating new routes and connections where none existed before. An example is the Erie Canal, which connects the Atlantic Ocean to the Great Lakes, vastly changing ecological and economic landscapes. Additionally, historical canals like those built by the ancient Egyptians around the Nile River facilitated navigation and trade between distant regions.Corridors created by canals, such as the Main-Danube Canal, which connects the Danube River to the Rhine River, serve as thoroughfares for various species, making them potential invasion corridors. There have been negative ecological impacts due to the spread of invasive species through these canals. Moreover, the engineering feats of these canals historically echo the advancements of human civilization in modifying landscapes to fit their economic and transportation needs....

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