Answer:
The permafrost found in the tundra is the permanently frozen subsoil layer.
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Carbon dioxide I think I’m sorry if I’m wrong just trying to help
It would be B
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When temperature drops, the relative humidity of an unsaturated parcel of air decreases. When it gets cold, the parcel of air also gets colder and it also gets wet and because of this, there is not much room left for water vapor.