Since the Endangered Species Act of 1973 was passed,about ______ species of animals and ______ species of plants and lichens have been placed on the list of threatened or endangered species.

Question

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According to the US Fish and Wildlife Service, since the Endangered Species Act of 1973 was passed, about 575 species of animals and 750 species of plants and lichens have been placed on the list of threatened or endangered species.

Since the Endangered Species Act of 1973 Was Passed,about ______