BILLINGS, Mont. — The Biden administration proposed bringing back rules to protect imperiled plants and animals on Wednesday as officials moved to reverse changes under former President Donald Trump that weakened the Endangered Species Act. The U.S. Fish and Wildlife Service said it would reinstate a decades-old regulation that mandates blanket protections for species newly classified as threatened. The blanket protections regulation was dropped in 2019 as part of a suite of changes to the application of the species law that were encouraged by industry, even as extinctions accelerate globally due to habitat loss and other pressures. Officials also would no longer consider economic impacts when deciding if animals and plants need protection.