Answer: "water vapor" .
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The layers are older towards the bottom and you get towards the top
Answer:
Tundra
Explanation:
Permafrost is a layer just beneath the surface of the ground that never thaws.
the answer is natural selection
Answer: They may be wind blown, rain splashed, carried by animals, or moved in soil or water. Almost all short-distance spread is through these natural dispersal mechanisms. In their home territory, short distance spread is rarely a problem because the resident plants and animals have evolved to coexist more or less peaceably.
Explanation:
