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.

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The Answer of 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.

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