Answer:
Mars has mountains, valleys, and volcanoes, but the red planet's are by far the biggest and most dramatic. Recent and continuing missions to Mars are showing that the Red Planet may be more geologically active than previously thought
Explanation:
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It means that it is impossible to get something for nothing, or the idea that even if something seems free, there is always a cost, no matter how indirect or hidden the cost is.
Seeing someone yawn, or even the thought of it, can make you yawn too.