Why do skeletal muscles work in pairs? a. one tightens and the other relaxes to make the bones move. b. multiple muscles have to tighten to make joints move. c. they cancel each other out. d. bones are resistant to movement.

A. i’m not sure on it tho

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.