Which choice represents a group of elements with common characteristics? a oxygen hydrogen lithium b silver iodine helium c copper oxygen silver d copper gold silver

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

hope this

it is a because im a fod nigba

a and b!

dfroos means which is a and b