What are three ways in which a country may grow in population

Natural increase, immigration, and by adding territory

Explanation:

- Natural increase means the normal increase in population by seeing the birth/death rate of the country we can see the natural increase in population of that country.

- Immigration means if the country allowed others people from other countries to come and live in their country, this will also leadto an increase in the population

- Adding territory can also increased population but in this peaceful world, there is not alot countries that want to adding more territory. In the past, this would be the best way t increase the size and population of country.

Hope this help :3

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )

answer; the automatic system because it is a "gut reactor"