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Signals are received from a ground station, amplified, and sent back to Earth on a different frequency by a ____

3. Signals are received from a ground station, amplified, and sent back to Earth on a different frequency by a ____.

1. Footprint
2. Antenna
3. Uplink
4. Transponder

Answer: D) Transponder

Explanation:

Signals are received from a ground station, amplified, and sent back to Earth on a different frequency by a transponder.