If successive generations of stars return material back to the interstellar medium which isenriched in heavier elements, then we expect that old stars are ________ compared to youngerstars.

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The Answer of If successive generations of stars return material back to the interstellar medium which isenriched in heavier elements, then we expect that old stars are ________ compared to youngerstars.

If Successive Generations of Stars Return Material Back to the Interstellar