Hey there!
The thin layer on Earth’s surface would be the CRUST.
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The "Demographic Transition" is a model that describes population change over time. It is based on an interpretation begun in 1929 by the American demographer Warren Thompson, of the observed changes, or transitions, in birth and death rates in industrialized societies over the past two hundred years or so.
By "model" we mean that it is an idealized, composite picture of population change in these countries. The model is a generalization that applies to these countries as a group and may not accurately describe all individual cases. Whether or not it applies to less developed societies today remains to be seen.
The answer is cultural group.
A cultural group is one in which its members share traditions, origins, beliefs and sometimes even a genetic inheritance. These groups usually vary generationally by sharing characteristics typical of the period in which they lived and are usually reflected in the way they interpret the world and interact with each other.
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first, it's "which" and what are the options?
