Answer:
D) World
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. Generally speaking, however, these migration effects on population growth rates are far smaller than the effects of changes in fertility and mortality.
The answer would be : Life consists of competitive struggles in which only the strong survive
It really similar with Darwin's "Survival of the fittest" theory
Social Darwinism is some sort of ideology, which apply the biological concepts of natural selection to the real modern world. According to this theory, the people with no power in society are similar with the creatures at the bottom of the food chain
I believe it the answer is B. Men made the tools and hunted for food. I hope this helped.
They irrigated dry lands. hope it helps