no comma is needed
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Answer:Light, heat, radio, and similar types of energy are carried by a variety of waves in the ELECTROMAGNETIC SPECTRUM. Some energy waves need a medium, such as water or air, through which to travel. The medium moves back and forth as waves carry energy through it, but it does not actually travel along with the wave.
Explanation:
The correct answer for this question is this one: "The speaker sees a child covered in soot, lying alone in the snow. Good start. The child tells him that his parents, who have forced him into chimney sweeping, are praying at a nearby church. " Hope this helps answer your question.
