Answer:
to keep the environment,animals and humans healthy and not rotten
Answer:
It is thicker below mountains than in valleys.
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Answer:
(A)
Explanation:
The population in the US and Canada is most dense along the coasts and navigable rivers where people were first able to get to settle. It is also affected by climate, soil quality. availability of water and the topography of the land. The least settled areas are very cold, swampy, desert wastelands and/or steep rocky , inaccessible areas which can be farmed or easily built upon.
