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Explanation:
The rate of population growth is the rate of natural increase combined with the effects of migration. Thus a high rate of natural increase can be offset by a large net out-migration, and a low rate of natural increase can be countered by a high level of net in-migration.
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Excuse me but i'm afraid you got the wrong subject
I believe it’s protection from invaders because mountains are known as natural barriers and make invasions difficult due to having to climb up the mountains
