Answer:i think it is B because
it the right awner
Explanation:
The process by which a highly developed population's rate of growth will stabilize is called Demographic Transition. Demographic transition is a model that describes the change in population over time. It is the transition in the birth and death rates over the past two hundred years.
A country needs rules about citizens cause in reality you cant have random people, bad record or not, coming in your country and just being a citizen instantly without any proof of trust, little do they know they could be a terrorist with the rights of a citizen just cause theirs no way to justify who's one or not.
The President is responsible for implementing and enforcing the laws written by Congress and, to that end, appoints the heads of the federal agencies, including the Cabinet. The Vice President is also part of the Executive Branch, ready to assume the Presidency should the need arise.