Which of the following issues is causing pollution and damage to water ecosystems in Nigeria? A. dam construction on the Niger River B. toxic dumping by factories C. spills from the nation’s oil production D. too many older vehicles on the roads\ Of the following issues, which is the most significant environmental challenge facing Africa today? A. deforestation due to the construction of shopping centers and restaurants B. desertification caused by poor agricultural practices C. air pollution resulting from the construction of factories in rural areas D. erosion of coastal areas because of sinking sea levels

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