Answer:
Immigrates are people who travel from one place to another and settle in the new region either for trading or livelihood. But as one region people immigrate to another region, lot of problems also arises . As the population at the new region increases than the natural place available for a particular region. This in turn leads to the depletion of the natural resources more than the normal level.
Increased usage of the natural resources makes it towards extinct. The food resources becomes less available due to huge demand leading to malnourishment. Increased industrialization causes increased chemicals release to the atmosphere causing harmful environment for the native people to survive. Job opportunities is decreased due to many people for the available post. Hence immigrants from Mexico and US created a lot of problems to the native people and the environment.
Answer:
7. Declining fertility rate
8. Britain, 18th Century
9. Interest rates were very low.
Explanation: 7. The causes of population ageing vary among countries.
8. It transformed economies that had been based on agriculture and handicrafts into economies based on large-scale industry, mechanized manufacturing, and the factory system. Also introduced Capitalism, Urbanization, exploitation of the working class.
9. Southern European countries also share, as a key feature, a combined and uneven capitalist development.
I'd say the answer is D. Hope this helps :)