Radio waves don't require a medium to move energy from place to place. What kind
of wave is it?

Explanation:

Electromagnetic waves are waves that can travel through a vacuum (empty space). They don't need a medium or matter. They travel through electrical and magnetic fields that are generated by charged particles. Examples of electromagnetic waves include light, microwaves, radio waves, and X-rays.

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the answer is c.) there is a warm front in region a and a stationary front in region b.