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 is B) closed because it flows through things. For example: Light switches on the inside. I hope this helps.
The answer is: <span>the directionality problem
</span><span>the directionality problem refers to a type of problem in which the cause and effect relationship is not known.But even though the relationship is not known, we can now for sure that the problem is exist because it shows obvious effect/symtomps.</span>