How do stars recycle matter? A. They stay on the main sequence.
B. Black holes form and recycle stellar gas for new stars.
C. Gravity pulls together gases and matter from old stars to create new ones.

C

Explanation:

Stars forge heavy elements and return their gas to space. This material enriches gas clouds from which new stars are formed, and the cycle continues. Each generation of stars is made in part from the ashes of previous generations.

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.

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explanation: