Going, Going Gone?Versión en línea Reading comprehension por Elvia Maria Sian Figueroa 1 More than 18,000 species are believed to be in danger of extintion. Yes No 2 About one-fourth of the world's species have disappeared since 1970. Yes No 3 Aurochs had gone extinct by the early 1600s. Yes No 4 The passenger pigeon once populated the western U.S. and Canada. Yes No 5 At present, the mountain gorilla is considered vulnerable. Yes No 6 The habitat of the polar bear is in the southern hemisphere. Yes No 7 Whooping cranes have made a partial recovery. Yes No 8 Climate change is considered the most significant cause of extinction. Yes No
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